An Rh + woman is pregnant with an Rh- fetus. The consequences can be:

1.	There is usually no risk during the first pregnancy, but it can harm the fetus during a subsequent pregnancy if the mother is not treated.
2.	It always poses a serious risk to the fetus, even in the first pregnancy.
3.	Only in rare cases is there a risk to the fetus during the first pregnancy.
4.	There is no risk to the fetus when a woman who is Rh+ carries an Rh- fetus.

What is true for the blood Type O?

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)

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

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.

How do parasympathetic neural signals affect the working of the heart?