Q. No.Adult human RBCs are enucleate. Which of the following statement(s) is/are most appropriate explanation for this feature?
(I) They do not need to reproduce.
(II) They are somatic cells.
(III) They do not metabolise.
(IV) All their internal space is available for oxygen transport.
1. Only (IV)
2. Only (I)
3. (I), (III) and (IV)
4. (II) and (III)
(I) They do not need to reproduce.
(II) They are somatic cells.
(III) They do not metabolise.
(IV) All their internal space is available for oxygen transport.
2. Only (I)
3. (I), (III) and (IV)
4. (II) and (III)
Name the blood cells, whose reduction in number can cause clotting disorder, leading to excessive loss of blood from the body.
1. Erythrocytes
2. Leucocytes
3. Neutrophils
4. Thrombocytes
Serum differs from blood in
1. lacking globulins
2. lacking albumins
3. lacking clotting factors
4. lacking antibodies
In mammals, which blood vessel would normally carry largest amount of urea?
1. Dorsal aorta
2. Hepatic vein
3. Hepatic portal vein
4. Renal vein
Blood pressure in the pulmonary artery is
1. more than that in the carotid
2. more than that in the pulmonary vein
3. less than that in the venae cavae
4. same as that in the aorta
Doctors use a stethoscope to hear the sounds produced during each cardiac cycle. The second sound is heard when
1. AV valves open up
2. Ventricular walls vibrate due to gushing in of blood from atria
3. Semilunar valves close down after the blood flows into vessels from ventricles
4. AV node receives the signal from SA node
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Person with blood group AB is considered as universal recipient because he has
1. Both A and B antigens on RBC but no antibodies in the plasma
2. Both A and B antibodies in the plasma
3. No antigen on RBC and antibody in the plasma
4. Both A and B antigens in the plasma but no antibodies.
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How do parasympathetic neural signals affect the working of the heart?
1. Reduce both heart rate and cardiac output
2. Heart rate is increased without affecting the cardiac output
3. Both heart rate and cardiac output increase
4. Heart rate decreases but cardiac output increases
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Consider the following statements:
I. Heparin can be used as anticoagulant both in-vivo and in vitro.
II. Plasmin prevents thrombus formation.
III. Lack of factor IX causes hemophilia B.
Which of the above statements are true?
1. I and II only 2. I and III only
3. II and III only 4. I, II, and III
Consider the following statements:
| I: | 70% of ventricular filling is due to the passive opening of AV valves. |
| II: | Lub is caused by the simultaneous closure of both AV valves. |
| III: | Dub is caused by simultaneous closure of both the semilunar valves. |
Which of the above statements are true?
| 1. | I and II only | 2. | I and III only |
| 3. | II and III only | 4. | I, II, and III |
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