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Control And Coordination Mcq
Quiz 11
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Q.1
In the diagram, what do a, b, c, d and e represent .. [kerala 2010]
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a) Axon terminal, synaptic cleft, synaptic vesicls, neurotransmitters and acceptors
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b) Synaptic cleft, synaptic vesicles, axon terminal, neurotansmitter and receptors
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c) Axon terminal, synaptic vesicles, synaptic clef, receptors and neurotransmitters
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d) Synaptic vesicles, axon terminal, synaptic cleft, receptors and neurotransmitters
Explanation
Answer : (c)
Q.2
Which one of the following statements is not correct ? …[AIPMT 2014]
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a) Retinal is a derivative of Vitamin C.
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b) Rhodopsin is the purplish red protein present in rods only.
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c) Retinal is the light absorbing portion of visual photo pigments.
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d) In retina the rods have the photopigment rhodopsin while cones have three different photopigments.
Explanation
Carotene is the source of retinal which is involved in formation of rhodopsin of rod cells. Retinal, a derivative of vitamin A, is the light-absorbing part of all visual photo pigments. Answer:(a)
Q.3
A gymnast is able to balance his body upside down even in the total darkness because of : …[AIPMT 2015]
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a) Organ of corti
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b) Cochlea
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c) Vestibular apparatus
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d) Tectorial membrane
Explanation
The organ of Corti is a specialized sensory epithelium that allows for the transduction of sound vibrations into neural signals. The cochlea (auditory inner ear) transforms the sound in neural message. The function of the cochlea is to transform the vibrations of the cochlear liquids and associated structures into a neural signal The vestibular system, one portion of the membraneous labyrinth of the inner ear, is a collection of structures that provide you with your sense of balance and an awareness of your spatial orientation. The tectorial membrane (TM) is an extracellular connective tissue that covers the mechanically-sensitive hair bundles of the sensory receptor cells in the inner ear. Answer:(c)
Q.4
Which of the following regions of the brain is incorrectly paired with its function ? …[AIPMT 2015]
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a) Cerebrum - calculation and contemplation
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b) Medulla oblongata - homeostatic control
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c) Cerebellum - language comprehension
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d) Corpus callosum - communication between the left and right cerebral cortices
Explanation
Cerebrum performs higher functions like interpreting touch, vision and hearing, as well as speech, reasoning, emotions, learning, and fine control of movement Option (a) correct pairing homeostatic dynamic state of equilibrium is the condition of optimal functioning for the organism and includes many variables, such as body temperature and fluid balance, The medulla oblongata helps regulate breathing, heart and blood vessel function, for temperature and fluid balance Option (b) correct pairing The cerebellum coordinates voluntary movements such as posture, balance, coordination, and speech, resulting in smooth and balanced muscular activity.Option (c) incorrect pairing The primary function of the corpus callosum is to integrate motor, sensory, and cognitive performances between the cerebral cortex on one side of the brain to the same region on the other side. Option (d) correct pairing Answer:(c)
Q.5
Photosensitive compound in human eye is made up of :- …[AIPMT-2016]
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a) Guanosine and Retinol
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b) Opsin and Retinal
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c) Opsin and Retinol
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d) Transducin and Retinene
Explanation
The photosensitive pigment Rhodopsin of the human eye is made up of opsin and Retinal ( the aldehyde form of vitamin-A/ Retinol) Answer:(b)
Q.6
A diagram showing axon terminal and synapse is given. Identify correctly at least two of A-D …[NEET 2013]
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a) A – Receptor C - Synaptic vesicles
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b) B - Synaptic connection D - K+
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c) A – Neurotransmitter B - Synaptic cleft
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d) C – Neurotransmitter D - Ca++
Explanation
A – Receptor B – Synaptic cleft C – Synaptic vesicles D – Ca++ Answer:(a)
Q.7
Parts A, B, C and D of the human eye are shown in the diagram. Select the option which gives correct identification along with its functions/ characteristics …[NEET 2013]
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a) A – Retina – contains photo receptors – rods and cones.
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b) B – Blind spot – has only a few rods and cones.
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c) C – Aqueous chamber – reflects the light which does not pass through the lens.
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d) D – Choroid – its anterior part forms ciliary body.
Explanation
A – Retina B – Blind spot C – Aqueous chamber D – Sclera Answer:(a)
Q.8
Choose the correct statement. …[NEET 2016]
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a) Photoreceptors in the human eye are depolarized during darkness and become hyperpolarized in response to the light stimulus.
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b) Receptors do not produce graded potentials.
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c) Nociceptors respond to changes in pressure.
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d) Meissner's corpuscles are thermo receptors.
Explanation
Graded potentials are primarily generated by sensory input, causing a change in the conductance of the membrane of the sensory receptor cell. Option (b) is not correct Nociception is the sensory process that provides the signals that lead to pain. This occurs through nociceptors, primary sensory neurons that are activated by stimuli that cause tissue damage. Stimuli can include tissue injury, extremes of heat and noxious chemicals. Option (c) is not correct Meissner's corpuscles; discovered by anatomist Georg Meissner (1829–1905) and Rudolf Wagner) are a type of mechanoreceptor. They are a type of nerve ending in the skin that is responsible for sensitivity to light touch. Option (d) is not correct Answer:(a)
Q.9
Good vision depends on adequate intake of carotene rich food Select the best option from the following statements ….[NEET- 2017] (a) Vitamin A derivatives are formed from carotene (b) The photopigments are embedded in the membrane discs of the inner segment (c) Retinal is a derivative of vitamin A (d) Retinal is a light absorbing part of all the visual photopigments
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a) (a) & (b)
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b) (a), (c) & (d)
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c) (a) & (c)
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d) (b), (c) & (d)
Explanation
Carotene is the source of retinal which is involved in formation of rhodopsin of rod cells. Retinal, a derivative of vitamin A, is the light-absorbing part of all visual photopigments. Answer:(b)
Q.10
Receptor sites for neurotransmitters are present on ….[NEET- 2017]
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a) Membranes of synaptic vesicles
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b) Pre-synaptic membrane
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c) Tips of axons
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d) Post-synaptic membrane
Explanation
Pre-synaptic membrane is involved in the release of neurotransmitter in the chemical synapse. The receptors sites for neurotransmitters are present on post-synaptic membrane. Answer:(d)
Q.11
In mammalian eye, the 'fovea' is the center of the visual field, where : [ ReAIPMT 2015]
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a) more rods than cones are found.
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b) high density of cones occur, but has no rods
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c) the optic nerve leaves the eye
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d) Only rods are present
Explanation
At the posterior pole of the eye lateral to the blind spot, there is a yellowish pigmented spot called macula lutea with a central pit called the fovea. It is a thinned-out portion of the retina where only the cones are densely packed. It is the point where the visual acuity (resolution) is the highest. Answer:(b)
Q.12
Destruction of the anterior horn cells of the spinal cord would result in loss of :- [ ReAIPMT 2015]
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a) Integrating impulses
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b) Sensory impulses
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c) voluntary motor impulses
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d) Commissural impulses
Explanation
The anterior grey column is the column where the cell bodies of alpha motor neurons are located. which is the front column of grey matter in the spinal cord contains motor neurons that affect the axial muscles anterior horn cells (also called anterior grey column) Destruction of the anterior horn cells of the spinal cord would result in loss of voluntary motor impulses. Answer:(c)
Q.13
The transparent lens in the human eye is held in its place by … … [NEET 2018]
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a) ligaments attached to the ciliary body
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b) ligaments attached to the iris
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c) smooth muscles attached to the iris
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d) smooth muscles attached to the ciliary body
Explanation
The transparent lens in the human eye is held in its place with the help of suspensory ligaments of the lens attached to the ciliary body which is a ring of fibrus tissues Answer : (a)
Q.14
Which of the following structures or regions is incorrectly paired with its function ? … … [NEET 2018]
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a) Medulla oblongata : controls respiration and cardiovascular reflexes.
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b) Limbic system : consists of fibre tracts that interconnect different regions of brain; controls movement.
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c) Hypothalamus : production of releasing hormones and regulation of temperature, hunger and thirst.
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d) Corpus callosum : band of fibers connecting left and right cerebral hemispheres.
Explanation
The medulla oblongata helps regulate breathing, heart and blood vessel function, digestion, sneezing, and swallowing. limbic system are involved in motivation, emotion, learning, and memory. pairing is not correct The hypothalamus controls body temperature, hunger, important aspects of parenting and attachment behaviours, thirst, fatigue, sleep, and circadian rhythms. The primary function of the corpus callosum is to integrate motor, sensory, and cognitive performances between the cerebral cortex on one side of the brain to the same region on the other side. Answer : (b)
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