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Control And Coordination Mcq
Quiz 10
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Q.1
During transmission of nerve impulse through a nerve fibres, the potential on the inner side of plasma membrane would change …. [ CBSE 2007]
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a) First negative, then positive and continue to be positive
0%
b) First positive, then negative and continue to be negative
0%
c) First positive, then negative and again back to positive
0%
d) First negative, then positive and again back to negative
Explanation
Reflex action ( withdrawal of hand from heat source ) is controlled by Spinal cord Answer : (d)
Q.2
Facial nerve arising from medulla is
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a) Motor
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b) Sensory
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c) Both a. and b.
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d) None of the above
Explanation
The facial nerve is the seventh cranial nerve, or simply cranial nerve VII. It Sensory, motor and PSNS Answer : (c)
Q.3
Joint between the axon of a neuron and dendrite of next is called
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a) Synapse
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b) Synapsis
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c) Junction
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d) Bridge
Explanation
Between the axon ending and the dendrite of the next neuron is a very tiny gap called the synapse Answer : (a)
Q.4
The branched tree-like structure / Tree of life present in the cerebellum is
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a) Arbor vitae
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b) Arborial
0%
c) Archenteron
0%
d) Areole
Explanation
Answer : (a)
Q.5
Organs of Ruffini are receptors of
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a) Cold
0%
b) Pressure
0%
c) Heat
0%
d) Touch
Explanation
Organs of Ruffini act as thermo-receptors that respond for a long time Answer : (c)
Q.6
Fluid found between piamater and arachnoid is … [ MHTCET 2010]
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a) Subdural fluid
0%
b) Cerebrospinal fluid
0%
c) Tissue fluid
0%
d) Lymph
Explanation
Fluid found between piamater and arachnoid is Cerebrospinal fluid Answer : (b)
Q.7
Blood brain barrier .. .. [ JKCET 2012]\
0%
a) Consists of anatomical and physiological factors
0%
b) Regulates passage of substances from blood to interstitial fluid
0%
c) Due to formation of tight junction between adjacent endothelial capillary cells
0%
d) All the above
Explanation
The blood–brain barrier consists of endothelial cells lining brain capillaries. It serves to restrict and control the movement of substances between the general circulation and brain extracellular fluid. It participates in regulating the volume and composition of fluid surrounding the brain through specific transport processes, and thus contributes to homoeostasis of the central nervous system. The barrier function of the blood–brain barrier is due to: (1) tight junctions that restrict movement of substances between the endothelial cells, (2) specific transport proteins that determine which substances can cross the barrier transcellularly and (3) enzymes that may degrade or alter substances prior to passage. Answer : (d)
Q.8
The sweet taste is better detected by
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a) Tip of the tongue
0%
b) Base of the tongue
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c) Middle of the tongue
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d) Lateral sides of the tongue
Explanation
Answer : (a)
Q.9
Organ of corti occurs in
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a) Internal ear
0%
b) Middle ear
0%
c) External ear
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d) In between internal ear and middle ear
Explanation
The organ of Corti is located in the scala media of the cochlea of the inner ear between the vestibular duct and the tympanic duct and is composed of mechanosensory cells, known as hair cells. Answer : (a)
Q.10
Autonomic nervous system affects
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a) Reflex actions
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b) Internal organs
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c) Sensory organs
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d) Motor organs
Explanation
The autonomic nervous system is a control system that acts largely unconsciously and regulates bodily functions such as the heart rate, digestion, respiratory rate, pupillary response, urination, and sexual arousal. Answer : (b)
Q.11
Correct sequence of regions in organization of auditory mechanoreceptor organ is
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a) Pinna – tympanic membrane – auditory canal – cochlea – malleus – incus – stapes – auditory nerve
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b) Pinna – malleus – incus – stapes – auditory canal – tympanic membrane – cochlea – auditory nerve
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c) Pinna – auditory canal – tympanic membrane – malleus – incus – stapes – cochlea – auditory nerve
0%
d) Pinna – cochlea – tympanic membrane – auditory membrane - auditory canal – incus – malleus – stapes – cochlea auditory nerve
Explanation
Mechanoreceptor: A sense organ or cell that responds to mechanical stimuli such as touch or sound. Pinna – auditory canal – tympanic membrane – malleus – incus – stapes – cochlea – auditory nerve Answer : (c)
Q.12
Characteristics of graded potential is … .. [ AMU 2009]
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a) Always followed by a refractory period
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b) Amplitude is always the same
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c) Duration and strength varies
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d) All or none response
Explanation
Amplitude is proportional to the strength of the stimulus. Amplitude is generally small. No refractory period is associated with graded potentials. Answer : (c)
Q.13
Which is required intact for sound reflex action
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a) Spinal cord
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b) Hypothalamus
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c) Cerebellum
0%
d) Medulla oblongata
Explanation
The acoustic reflex is an involuntary muscle contraction that occurs in the middle ear in response to high-intensity sound stimuli or when the person starts to vocalize.Spinal cord is main component of reflex action. Answer : (a)
Q.14
Sound is transmitted from middle ear to internal ear due to
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a) Vibrations of tympanum
0%
b) Vibrations of stapes
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c) Striking of stapes
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d) All of these
Explanation
Sound is transmitted from middle ear to internal ear due to striking of stapes Answer : (c)
Q.15
It converts short term memory into long term remembrance … ..[ Guj CET 2011]
0%
a) Reticular system
0%
b) Thalamus
0%
c) Medulla oblongata
0%
d) Hippocampus
Explanation
The hippocampus deals with the formation of long-term memories and spatial navigation. Answer: (d)
Q.16
Purplish red pigment rhodopsin contained in rod type of photoreceptor cells of the human eye, is a derivative of
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a) Vitamin A
0%
b) Vitamin B
0%
c) Vitamin C
0%
d) Vitamin D
Explanation
Humans cannot make Rhodopsin, instead they use and external source, b-carotene, that is found in food in order to synthesis it: Answer : (a)
Q.17
Aperture of pupil is controlled by
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a) Conjunctiva
0%
b) Cornea
0%
c) Iris
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d) Retina
Explanation
Light enters the eye through the pupil, and the iris regulates the amount of light by controlling the size of the pupil. Answer : (c)
Q.18
Match the column
a) Diencephalon
1) Cerebellum
b) Telencephalon
2) Medulla
c) Myelencephalon
3) Amygdala
d) Metencephalon
4) Thalamus
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a) a – 4, b – 3, c – 2 d- 1
0%
b) a – 4, b -3, c – 1, d – 2
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c) a -3, b – 4, c – 1, d -2
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d) a -1, b -2, c -3 d – 4
Explanation
Diencephalon develop in adult as Epithalamus, Thalamus, Hypothalamus, Subthalamus, Pituitary, Pineal, Third ventricle Telencephalon: develop in adult as Rhinencephalon, Amygdala, Hippocampus, Cerebrum(Cortex), Basal Ganglia,Lateral ventricles Myelencephalondevelop in adult asMedulla Oblongata Metencephalon develop in adult as Pons, Cerebellum Mesencephalon develop in adult as Tectum, Cerebral peduncle, Pretectum, Cerebral aqueduct Answer : (a)
Q.19
Nerve axon takes part in
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a) Receiving impulse
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b) Transformation of energy
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c) Conduction of impulse
0%
d) Providing energy for impulse transmission
Explanation
Nerve axon takes part in conduction of impulse Answer : (c)
Q.20
Number of cranial nerves in Camel is
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a) 10
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b) 11
0%
c) 12
0%
d) 14
Explanation
In higher vertebrates (reptiles, birds, mammals) there are 12 pairs of cranial nerves: Lower vertebrates (fishes, amphibians) have 10 pairs. Answer : (c)
Q.21
Adaptation of eye in dark occurs due to
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a) Depletion of visual pigments in rode
0%
b) Depletion of visual pigments in cones
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c) Repletion of visual pigments in cones
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d) Repletion of visual pigments in rod
Explanation
Repletion is a condition of being completely full of something Rhodopsin is extremely sensitive to light, and thus enables vision in low-light conditions rhodopsin is found in roads Answer : (d)
Q.22
Assertion: The imbalance in concentration of Na+, K+ and proteins generates resting potential reason: To maintain unequal distribution of Na+ and K+ neurons use electrical energy
0%
a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion
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b) The Assertion and Reason are true but Reason is not correct explanation of Assertion
0%
c) Assertion is true but, Reason is false
0%
d) Assertion is false but, Reason is true
Explanation
Na+-K+ pump uses ATP as energy source Primary active transport directly uses a source of chemical energy (e.g., ATP) to move molecules across a membrane against their gradient Answer : (c)
Q.23
Synaptic vesicle occurs in … ..[ DPMT 2007]
0%
a) Presynaptic neuron
0%
b) Post-synptic neuron
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c) Synaptic cleft
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d) None of the above
Explanation
In a neuron, synaptic vesicles (or neurotransmitter vesicles) store various neurotransmitters that are released at the synapse. A presynaptic neuron is a nerve cell that releases chemical messengers called neurotransmitters into the synapse. Anatomically, the presynaptic neuron is the neuron before the synapse, this neuron is delivering the "message" across the synapse to the postsynaptic neuron. The postsynaptic neuronis the "receiver" of the neurotransmitter "message". synaptic cleft called also synaptic gap. the spacebetween neurons at a nerve synapse across which a nerve impulse is transmitted by a neurotransmitter. Answer : (a)
Q.24
Venom of cobra affects
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a) Respiratory system
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b) Nervous system
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c) Circulatory system
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d) Digestive system
Explanation
Cobra, mamba, and coralsnakes, their venom is neurotoxic (nerve toxins) and paralyses the respiratory centre. Viperine venom is typically haemotoxic (blood toxins), necrotising (death of tissue), and anticoagulant (preventing the blood from clotting) Answer : (b)
Q.25
Static equilibrium is maintained by
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a) Sacculus
0%
b) Utriculus
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c) Semicircular canals
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d) Both a and b
Explanation
two fluid-filled sacs forming part of the labyrinth of the inner ear (the other being the utriculus). Three semicircular ducts and two chambers, which contain the saccule and utricle, enable the body to detect any deviation from equilibrium and maintain static equilibrium. Answer: (d)
Q.26
Which one is photosensitive in mammals
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a) Retinol
0%
b) Rhodopsin
0%
c) Melanin
0%
d) Sclerotin
Explanation
Rhodopsin (also known as visual purple) is a light-sensitive receptor protein involved in visual phototransduction. Answer : (b)
Q.27
State of complete inexcitability between polarization and repolarisation is
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a) Refractory period
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b) Synaptic delay
0%
c) Action potential
0%
d) Depolarisation
Explanation
Refractory period – period of time, after neuron has generated an action potential, when neuron cannot be stimulated to generate another action potential Answer : (a)
Q.28
Cornea is transplantation is successful as cornea is
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a) Easily available
0%
b) Without blood supply
0%
c) Easily preserved
0%
d) Easily stiched
Explanation
Rejection is unusual after corneal transplantation because the cornea usually does not have blood vessels. Without blood vessels the body's immune system is less likely to recognise and reject the “foreign” graft. The cornea in patients with keratoconus does not usually have blood vessels. Answer : (b)
Q.29
Releasing of chemical messenger from synaptic vesicles is triggered by … ..[ AIIMS 2012]
0%
a) Mg2+, Sr2+
0%
b) Fe, S
0%
c) Cl
0%
d) Ca2+
Explanation
Calcium ions trigger the release of neurotransmitter from synaptic vesicles into the synaptic cleft Answer : (d)
Q.30
Color blindness is due to defect in
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a) Cones
0%
b) Rods
0%
c) Rods and cones
0%
d) Rhodopsin
Explanation
There are three types of cone cells and each type has a different sensitivity to light wavelengths. One type of cone perceives blue light, another perceives green and the third perceives red. Severe color blindness occurs when all three conecells are absent. Mild color blindness happens when all three cone cells are present but one cone cell does not work right Answer : (a)
Q.31
When we move from dark to light, we fail to see for some time but soon the visibility becomes normal. It is
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a) Accommodation
0%
b) Adaptation
0%
c) Photoperiodism
0%
d) Mutation
Explanation
When we move from dark to light, we fail to see for some time but soon the visibility becomes normal. It is Adaptation. A minor mechanism of adaptation is the pupillary light reflex, adjusting the amount of light that reaches the retina. In response to varying ambient light levels, rods and cones of eye function both in isolation and in tandem to adjust the visual system. Answer : (b)
Q.32
Spinal cord and brain constitute … [ MHT CET 2008]
0%
a) Autonomous nervous system
0%
b) Brain stem
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c) Central nervous system
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d) Corpus callosum
Explanation
The three main components of the central nervous system are the brain, spinal cord and neurons Answer : (c)
Q.33
Gland found in eye skin of rabbit is
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a) Meibomian gland
0%
b) Perineal gland
0%
c) Lacrymal
0%
d) Harderian gland
Explanation
The meibomian glands, located in the tarsal plate of the rabbit eyelid, are sebaceous (oil-secreting) glands. Its secretions help lubricate the eyelids. Answer : (a)
Q.34
A purely motor cranial nerve is ….. [ MHTCET 2010]
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a) Olfactory
0%
b) Optic
0%
c) Abducens
0%
d) Vagus
Explanation
Cranial Nerve
Name
Function
I
The Olfactory Nerve
Sense of Smell
II
The Optic Nerve
Vision
III
The Oculomotor Nerve
Raise eyelids, move eyes, regulate the size of pupils, focus of lenses.
IV
The Trochlear Nerve
Eye movements, proprioception
V
The Trigeminal Nerve
Sensations of the head and face, chewing movements, and muscle sense.
VI
The Abducent Nerve
Produce movements of the eyes
VII
The Facial Nerve
Facial expressions, secretion of saliva, taste.
VIII
The Vestibulocochlear Nerve
Balance or equilibrium sense. Hearing.
IX
The Glossopharyngeal Nerve
Taste and other sensations of tongue, swallowing, secretion of saliva, aid in reflex control of blood pressure and respiration.
X
The Vagus Nervehistorically cited as the pneumogastric nerve
Transmit impulses to muscles associated with speech, swallowing, the heart, smooth muscles of visceral organs in the thorax, and abdomen.
XI
Accessory nerve
Turning movements of the head, movements of the shoulder and viscera, voice production.
XII
Hypoglossal
Tongue movements
Answer : (c)
Q.35
Autonomic nervous system affects … [ MPPMT 2007]
0%
a) Reflex actions
0%
b) Internal organs
0%
c) Sensory organs
0%
d) Motor organs
Explanation
The autonomic nervous system (ANS) controls functions of the internal viscera, blood vessels throughout the body, effectors in the skin and glands, in fact all organs except voluntarily controlled striated muscle. Answer : (b)
Q.36
Reflex arc made of two neutrons is …. [ WB 2011]
0%
a) Asynaptic
0%
b) Monosynaptic
0%
c) Disynaptic
0%
d) Polysynaptic
Explanation
When a reflex arc consists of only two neurons in an animal (one sensory neuron, and one motor neuron), it is defined as monosynaptic. Answer : (b)
Q.37
The direction of light reaching retina will be
0%
a) Photosensory cells - Bipolar neurons – Ganglionic cells
0%
b) Ganglionic cells – Photosensory cells – Bipolar neurons
0%
c) Ganglionic cells – Bipolar neurons – Photosensory cells
0%
d) Photosensory cells – Ganglionic cells – Bipolar neurons
Explanation
(a) Ganglionic cells (b) Bipolar neurons (c) Photosensory cells (d) Pigment epithelium Answer : (c)
Q.38
By origin brain is
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a) Endodermal
0%
b) Peridermal
0%
c) Mesodermal
0%
d) Ectodermal
Explanation
the ectoderm differentiates to form the nervous system spine, peripheral nerves and brain Answer : (d)
Q.39
Cells of Deiter occur in
0%
a) Retina
0%
b) Organ of corti
0%
c) Utriculus
0%
d) Sebaceous gland
Explanation
Organ of Corti is composed of mechanosensory cells, known as hair cells, positioned on the basilar membrane of the organ of Corti are three rows of outer hair cells (OHCs) and one row of inner hair cells (IHCs). Separating these hair cells are supporting cells: Deiters cells, also called phalangeal cells Answer : (b)
Q.40
Ventricle connecting medulla oblongata with spinal cord is
0%
a) Fourth
0%
b) Fifth
0%
c) Third
0%
d) Second
Explanation
The fourth ventricle has a characteristic diamond shape in cross-sections of the human brain. It is located within the pons or in the upper part of the medulla. CSF entering the fourth ventricle through the cerebral aqueduct can exit to the subarachnoid space of the spinal cord through two lateral apertures and a single, midline median aperture. Answer : (a)
Q.41
In mammals the brain centre regulating body temperature is found in
0%
a) Cerebellum
0%
b) Cerebral lobe
0%
c) Hypothalamus
0%
d) Medulla oblongata
Explanation
The hormones from the hypothalamus govern physiologic functions such as temperature regulation, thirst, hunger, sleep, mood, sex drive, and the release of other hormones within the body. Answer : (c)
Q.42
Too short eye ball and too flat lens produce
0%
a) Astigmatism
0%
b) Presbyopia
0%
c) Near sightedness
0%
d) Far sightedness
Explanation
Farsightedness or hyperopia, is caused when the curvature of the cornea is too flat, or the eyeball is too short, forcing light to focus behind the retina. Farsightedness (hyperopia) is a common vision condition in which you can see distant objects clearly, but objects nearby may be blurry. The degree of your farsightedness influences your focusing ability. Answer : (a)
Q.43
Myelin sheath is produced by ….[NEET- 2017]
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a) Schwann Cells and Oligodendrocytes
0%
b) Astrocytes and Schwann Cells
0%
c) Oligodendrocytes and Osteoclasts
0%
d) Osteoclasts and Astrocytes
Explanation
Oligodendrocytes are neuroglial cells which produce myelin sheath in central nervous system while Schwann cell produces myelin sheath in peripheral nervous system. Answer:(a)
Q.44
Cutaneous plexus and papillary plexus consist of
0%
a) A network of arteries providing dermal supply
0%
b) Network of nerves providing dermal sensation
0%
c) Specialized cells for cutaneous sensation
0%
d) Gland cells that release cutaneous secretions
Explanation
Cutaneous Plexus: .network of arteries that forms in the subcutaneous tissue and along the reticular layer of the dermis. Papillary plexus: branching network covers the blood supply from the papillary layer of the dermis into the epidermis Answer : (a)
Q.45
A serious eye effect which can lead to blindness is … [ kerala 2003]
0%
a) Myopia
0%
b) Hypermetropia
0%
c) Presbyopia
0%
d) Glaucoma
Explanation
Glaucoma is a condition that causes damage to eye's optic nerve and gets worse over time. It's often linked to a buildup of pressure inside eye. Answer : (d)
Q.46
Fenestra ovalis is
0%
a) Air filled cavity of middle ear
0%
b) External opening of tympanic cavity
0%
c) Opening of auditory capsule
0%
d) Communication between pharynx and tympanic cavity
Explanation
auditory capsule the bony or cartilaginous capsule that encloses the middle and inner parts of the ear. A small natural hole or opening, especially in a bone. The mammalian middle ear is linked by the fenestra ovalis to the vestibule of the inner ear, and by the fenestra rotunda to the cochlea. Answer : (c)
Q.47
Excessive stimulation of vagus nerve may lead to
0%
a) Hoarse voice
0%
b) Peptic ulcers
0%
c) Efficient digestion of proteins
0%
d) Irregular contraction of diaphragm
Explanation
Excessive stimulation of vagus nerve causes stimulation of the superior and recurrent laryngeal nerves and is associated with problems ranging from alteration of voice (66%), coughing (45%), pharyngitis (35%) and throat pain (28%) and hoarseness (very common) to frank laryngeal muscle spasm and upper airway obstruction. Answer : (a)
Q.48
The following diagram indicates reflex arc. identify the parts labelled as a, b, c, d, e ,f and g. Choose the correct option ...[ KCET 2005]
0%
a) a - effector, b - motor nerve, c - ventral horn, d - interneuron, e- dorsal horn, f- sensory nerve, g - sense organ
0%
b) a - effector, b - motor nerve, c - dorsal horn, d - interneuron, e- ventral horn, f - sensory nerve, g - effecter
0%
c) a - sense organ , b - sensory nerve, c - ventral horn, d - interneuron, e - dorsal horn, f - motor nerve, g- effector
0%
d) a - sense organ, b - sensory nerve, c - dorsal horn, d - interneuron, e - ventral horn, f - motor nerve, g - effector
Explanation
Answer : (d)
Q.49
In the given diagram which stage of the donduction of nerve impulse through nerve fibre is obsereved .... [ Guj CET 2006]
0%
a) Repolarisation
0%
b) Polarisation
0%
c) Depolarisation
0%
d) Resting potential
Explanation
In figure Na-K pump shown in red is pumping Na+ out of cell and pumping K+ in cell Duringdepolarisation Na-K pump, pumping three positively charged sodium ions (Na+) out of the cell for every two positively charged potassium ions (K+) pumped into the cell, Answer : (c)
Q.50
In the accompanying diagram what do a, b, c, d and e respectively .... [ Kerala 2009]
0%
a) a - white matter, b - grey matter, c - dorsal root, d - ventral root, e - spinal nerve
0%
b) a -white matter , b - grey matter, c - ventral root, d - dorsal root, e - spinal nerve
0%
c) a - grey matter, b - white matter, c - ventral root, d - dorsal root, e - spinal nerve
0%
d) a -white matter , b - grey matter,, c - spinal root, d - ventral root, e - dorsal nerve
Explanation
Answer : (a)
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