Persons with 'AB' blood group are called as "Universal recipients". This is due to:

(1) Presence of antibodies, anti-A and anti-B, on RBCs

(2) Absence of antibodies, anti-A and anti-B, in plasma

(3) Absence of antigens A and B on the surface of RBCs

(4) Absence of antigens A and B in plasma

Which enzyme is responsible for the conversion of inactive fibrinogens to fibrins?

1. Epinephrine

2. Thrombokinase

3. Thrombin

4. Renin

The QRS complex in a standard ECG represents:

1.  Depolarisation of auricles

2.  Depolarisation of ventricles

3.  Reploarisation of ventricles

4.  Repolarisation of auricles 

Match  the following columns and select the correct option . 

1. (iv)    (i)   (ii)     (iii) 

2. (i)     (ii)   (iv)    (iii)

3. (ii)    (i)    (iii)    (iv) 

4. (iii)   (iv)   (ii)    (i)  

Which of the following is associated with a decrease in cardiac output?

1. Sympathetic nerves

2. Parasympathetic neural signals

3. Pneumotaxic center

4. Adrenal medullary hormones

Which of the following conditions causes erythroblastosis fetalis?

1. Mother ${\mathrm{Rh}}^{+\mathrm{ve}}$ and fetus ${\mathrm{Rh}}^{-\mathrm{ve}}$

2. Mother ${\mathrm{Rh}}^{-\mathrm{ve}}$ and fetus ${\mathrm{Rh}}^{+\mathrm{ve}}$

3. Both mother and fetus ${\mathrm{Rh}}^{-\mathrm{ve}}$

4. Both mother and fetus ${\mathrm{Rh}}^{+\mathrm{ve}}$

Match the Column I and Column II

Select the correct option 

      (a)    (b)   (c)  (d)

1.   (ii)    (iii)   (v)  (iv)

2.   (iv)   (i)     (ii)  (iii)

3.   (iv)   (i)     (ii)  (v)

4.   (ii)    (i)    (v)   (iii)    

What would be the heart rate of a person if the cardiac output is 5L, blood volume in the ventricles at the end of diastole is 100 mL and at the end of ventricular systole is 50 mL?

1. 125 beats per minute

2. 50 beats per minute

3. 75 beats per minute

4. 100 beats per minute

All the components of the nodal tissue are autoexcitable. Why does the SA node act as the normal pacemaker ?

1. SA node has the lowest rate of depolarisation

2. SA node is the only component to generate the threshold potential.

3. Only SA node can convey the action potential to the other

4. SA node has the highest rate of depolarisation.

A specialised nodal tissue embedded in the lower corner of the right atrium, close to Atrio-ventricular septum, delays the spreading of impulses to heart apex for about 0.1 sec.

This delay allows -

1. blood to enter aorta.

2. the ventricles to empty completely.

3. blood to enter pulmonary arteries.

4. the atria to empty completely.