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Quiz 4
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Q.1
Blood pressure is controlled by .... ... [ MPPMT 2004 ]
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a) Thyroid gland
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b) Adrenal gland
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c) Thymus gland
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d) Parathyroid gland
Explanation
Aldosterone helps control your blood pressure by managing the balance of potassium and sodium in your body. Answer : (b)
Q.2
In mature RBC, nucleus is present in .... [ Pb. PMT 2000 ]
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a) Rabbit
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b) Frog
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c) Both Rabbit and frog
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d) Neither in frog and rabbit
Explanation
With the exception of mammals, all vertebrate organisms have hemoglobin-containing cells in their blood and all of these red blood cells contain a nucleus. Answer : (b)
Q.3
Which is true of blood group agglutination test? ... ... [ AIIMS 1996 ]
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a) Blood group AB when coagulation occurs with antiserum A
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b) Blood group B when coagulation occurs with antiserum B
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c) Blood group O when coagulation occurs with antiserum A as well as B
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d) None of the above
Explanation
Coagulation also known as clotting. It potentially results in hemostasis. Antiserum B contains antibodies A. Antibodies in the antiserum bind the infectious agent or antigen. Answer : (b)
Q.4
than one correct answer Q92) Which is transmitted through serum .... ... [ kerala 2003 ]
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a) Venereal diseases
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b) Cirrhosis
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c) Tuberculosis
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d) Hepatitis B
Explanation
The hepatitis B virus is transmitted when blood, semen or another bodily fluid from an infected person enters the body of another individual. Venereal disease: A disease that is contracted and transmitted by sexual contact, caused by microorganisms that survive on the skin or mucus membranes, or that are transmitted via semen, vaginal secretions, or blood during intercourse. Answer : (a,d)
Q.5
Which ones of the following statements are wrong? ... ... [ kerala 2005 ] (a) Leucocytes disintegrate in spleen and liver (b) RBC, WBC and blood platelets are produced by bone marrow (c) Neutrophils bring about destruction and detoxification of toxins of protein origin (d) Important function of lymphocytes is to produce antibodies
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a) a and b only
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b) a and d only
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c) a and c only
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d) b and c only
Explanation
Leucocytes disintegrate in body fluid Liver represents the body’s major detoxification system. Answer : (c)
Q.6
In ECG deflection wave, ventricular systole occurs during... .... [ Har. PMT 2001 ]
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a) PQ
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b) QRS
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c) QR
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d) T
Explanation
Electrical activity
Associated pattern
Atrial Depolarization
P wave
Delay at AV node
PR Segment
Ventricular depolarization/ventricular systole
QRS Complex
Ventricular Repolarization
T- wave
No electric activity
Isoelectric Line
Repolarization of the ventricles begins at the epicardial surface of the ventricles and progresses inwardly through the ventricular walls to the endocardial surface. The T Wave occurs during the last part of the ventricular systole Answer : (d)
Q.7
Heart beats originate from ... ... [ CBSE 2002 ]
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a) Left atrium
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b) Right ventricle
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c) Cardiac muscles
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d) Pace maker
Explanation
The SA node is the heart's natural pacemaker. The SA node consists of a cluster of cells that are situated in the upper part of the wall of the right atrium (the right upper chamber of the heart). The electrical impulses are generated there. The SA node is also called the sinus node. Answer : (d)
Q.8
Raising of pH of blood shall result in ... .... [ MPPMT 1992 ]
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a) Inhibition of carbonic anhydrase
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b) Production of carbon monoxide and causing poisoning
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c) Non-release of carbon dioxide from carbonic acid and carbonates
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d) Non-dissociation of oxygen from oxyhaemoglobin
Explanation
According to Bohr effect an increase in pH shifts the curve to the left. A left shift indicates increased oxygen affinity of haemoglobin allowing less oxygen to be available to the tissues Answer : (d)
Q.9
Which one is the first heart sound... ..... [ Manipal 2001 ]
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a) Lubb during closure of atrioventricular valves
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b) Lubb during closure of semilunar valve
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c) Dub during closure of atrioventricular valve
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d) Dub during closure of semilunar valve
Explanation
The closure of the AV valves is heard as lub, the first heart sound (S1). The closure of the SL valves is heard as dub, the second heart sound (S2). Answer : (a)
Q.10
Origin of heart beat and its conduction is represented by .. ... [ WB 2011 ]
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a) AV node → Bundle of His → SA node → Purkinje fibres
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b) SA node → Purkinje fibres → AV node → Bundle of His
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c) Purkinje fibres → AV node → SA node → Bundle of His
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d) SA node → AV node → Bundle of His → Purkinje fibres
Explanation
Excitation of the heart arises in the pacemaker cells in the sino-atrial node (SA node) Excitation is carried from the SA node through the atria via Gap Junctions between cells. This wave of depolarization is responsible for causing the Atria to contract. AV node is the point of electrical communication between the atria and the ventricles. It has slow conduction velocity; this allows the atria time to contract before the signal reaches the ventricles and causes them to contract The Bundles of His and their branches, along with the Purkinje fibres, allow rapid spread of action potential to the ventricles. Answer : (d)
Q.11
Systemic circulation of oxygenated blood starts from ... ... [ Tamil nadue 2001 ]
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a) Right atrium
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b) Left atrium
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c) Left ventricle
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d) Right ventricle
Explanation
Answer : (c)
Q.12
Life span of blood platelets is ... ... [ MHTCET 2011]
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a) 1 -2 days
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b) 2 -3 days
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c) 3 - 4 days
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d) 5 -9 days
Explanation
Answer : (d)
Q.13
What is true about vein? ... ...[ BHU 2000 ]
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a) All veins carry deoxygenated blood
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b) All veins carry oxygenated blood
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c) They carry blood from organs towards heart
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d) They carry blood from heart towards the organs
Explanation
Answer : (c)
Q.14
The sequence of cardiac cycle is ... ... [ Odisha 2003 ]
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a) Atrial systole → Ventricular systole → Joint diastole
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b) Diastole → Atrial → Ventricular diastole
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c) Atrial systole → Ventricular diastole → Ventricular systole
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d) Ventricular diastole → Diastole → Ventricular systole → Atrial systole.
Explanation
Atrial Systole :Atria in contraction AV valves are open blood to ventricles. Ventricular systole:Ventricles in contraction semilunar valves are open blood passing to arteries. Ventricular diastole :All heart muscle in relaxation all heart valves are closed blood returning to atria. Atrial diastole: All heart muscle in relaxation all heart valves are closed blood returns to atria. Answer : (a)
Q.15
Pathway of myogenic impulse conduction is ... ... [ kerala 2004 ]
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a) SAN → AVN → Bundle of His → Purkinje fibres
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b) SAN → AVN → Purkinje fibres → Bundle of His
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c) AVN → SAN → Bundle of HIs → Purkinje fibres
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d) AVN → Bundle of His → SAN → Purkinje fibres
Explanation
The myogenic mechanism is how arteries and arterioles react to an increase or decrease of blood pressure to keep the blood flow within the blood vessel constant. Answer : (a)
Q.16
Blood has defective haemoglobin in ... .. [ KCET 2005 ]
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a) Sickle cell anaemia
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b) Haemophilia
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c) Haematuria
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d) Haematoma
Explanation
Sickle cell anemia (sickle cell disease) is a disorder of the blood caused by an inherited abnormal hemoglobin (the oxygen-carrying protein within the red blood cells). The abnormal hemoglobin causes distorted (sickled) red blood cells. The sickled red blood cells are fragile and prone to rupture. Answer : (a)
Q.17
A vein starts from capillaries and ends in capillaries ... .... [ RPMT 2002 ]
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a) Phrenic
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b) Coronary
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c) Portal vein
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d) Internal jugular
Explanation
The portal vein or hepatic portal vein is a blood vessel that carries blood from the gastrointestinal tract, gallbladder, pancreas and spleen to the liver. Thus starts from capillary and ends in capillaries Answer : (c)
Q.18
Pulmonary vein carries oxygenated blood from ... ... [ JIPMER 2003 ]
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a) Heart to its walls
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b) Heart to lungs
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c) Lungs to heart
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d) Heart to all body parts
Explanation
Answer : (c)
Q.19
Which one have open circulatory systemAscidiaCockroachEarthworm 4 Prawn 5 Silver Fish 6 Snail. 7 Squid .... .. [ kerala 2005 ]
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a) 2, 4, 6
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b) 1, 2, 4, 6
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c) 3, 4, 5, 7
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d) 2, 4, 5, 6
Explanation
Open Circulation: An open circulatory system is a type of circulatory system in which nutrients and waste are moved through the body with the assistance of a fluid which flows freely through the body cavity, rather than being contained in veins. It is found in leeches (annelids), arthropods like prawns, crabs, insects, spiders. Most of the molluscs except cephalopods show open circulatory system. Answer : (d)
Q.20
The vein that does not open in heart is ... .... [ EAMCET 2005 ]
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a) Precaval
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b) Postcaval
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c) Pulmonary
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d) Superior mesenteric
Explanation
Superior mesenteric vein is a blood vessel that drains blood from the small intestine. It termination behind the neck of the pancreas. Answer : (d)
Q.21
People living at sea level have around 5 million RBC/mm3 of blood where as those living at an altitude of 5400 m have around 8 million. This is due to ... .... [ CBSE 2006 ]
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a) There is more UV radiation which enhance RBCs production
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b) People eat more nutritive food which helps in formation of more RBCs
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c) People get pollution free air to breathe with more oxygen becoming available
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d) Atmospheric O2 is less so that more RBSs are needed to absorb the required amount of O2 to survive
Explanation
Answer : (d)
Q.22
Which one contains minimum urea? [ RPMT 2005 ]
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a) Hepatic portal vein
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b) Hepatic vein
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c) Renal vein
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d) Dorsal aorta
Explanation
The renal veins are veins that drain the kidney. They connect the kidney to the inferior vena cava. They carry the blood filtered by the kidney. Answer : (c)
Q.23
Number of leucocytes present in one mm3 of blood is ... ... [ KCET 1994 ]
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a) 5000 - 8000
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b) 2000 - 3000
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c) 8000 - 13000
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d) million to 1.5 million
Explanation
White Blood Cell Count: 4,500 - 11,000 (per cubic millimeter) Answer : (a)
Q.24
Which one is hypothetical coagulating factor? [ Pb PMT 2005 ]
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a) Accelerin
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b) Christmas factor
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c) Lakilovand factor
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d) Stuart factor
Explanation
Accelerin is obsolete term for what was once considered an intermediary product of coagulation but is no longer thought to exist. Hence Accelerin is called as hypothetical coagulating factor. Answer : (a)
Q.25
Which one is not true about chordae tendineae? They ... ... .. [ WB 2007 ]
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a) are stripes of muscles fibres
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b) are attached to valves
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c) regulate opening of valves
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d) prevent back flow of blood
Explanation
The chordae tendineae, as their Latin name suggests, are tendinous cords found in the right and left ventricles of the heart are attached to valves, regulate opening of, valves prevent back flow of blood Answer : (a)
Q.26
Wall of heart is covered externally by .. ... [ BHU 1996 ]
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a) Epicardium
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b) Epithelium
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c) Endothelium
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d) Glisson's capsule
Explanation
Epicardium: The inner layer of the pericardium, a conical sac of fibrous tissue that surrounds the heart and the roots of the great blood vessels. pericardium is the membrane that surrounds and protects the heart. Answer : (a)
Q.27
Which one is single cell in thickness ... ... [ Guj CET 2007 ]
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a) Venule
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b) Arteriole
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c) Blood capillary
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d) Artery
Explanation
Venules range from 7μm to 1mm in diameter. Venule walls have three layers: An inner endothelium composed of squamous endothelial cells that act as a membrane, a middle layer of muscle and elastic tissue and an outer layer of fibrous connective tissue An arteriole is a small-diameter blood vessel in the microcirculation that extends and branches out from an artery and leads to capillaries. Capillaries are much thinner than arteries and veins, because their walls are made up of only a single layer of endothelial cells, the flat cells that line all blood vessels The wall of an artery consists of three layers. The innermost layer, the tunica intima is simple squamous epithelium surrounded by a connective tissue basement membrane with elastic fibers. The middle layer, the tunica media, is primarily smooth muscle and is usually the thickest layer Answer : (c)
Q.28
Valves present between right auricle and right ventricle is ..... [ AIIMS 2011]
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a) Mitral valve
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b) Tricuspid valve
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c) Bicuspid valve
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d) Semilunar valve
Explanation
Answer : (b)
Q.29
Mixing of oxygenated and oxygenated blood occurs in the ventricle of ... ... [ Odisha 2007 ]
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a) Scoliodon
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b) Frog
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c) Rabbit
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d) Pigeon
Explanation
Scoliodon is fish have two chamber heart and deoxygenated flows through heart. Frog have three chamber heart and mixing of oxygenated and deoxygenated blood occurs in the ventricle. Rabbit and Pigeon have four chamber heart Answer : (b)
Q.30
Valve present over left auriculo-ventricular opening is ... .. [ MHTCET 2009 ]
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a) Semilunar valve
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b) Tricuspid valve
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c) Valve of Thebesius
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d) Bicuspid
Explanation
Answer : (d)
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