Incomplete double circulation is seen in

• Fish

• Amphibians

• Birds

• Mammals

• Mammals

Muscles of the heart are

• striated and voluntary

• non-striated and voluntary

• striated, unbranched and involuntary

• non-striated and involuntary

• non-striated and involuntary

Choose the wrong statement regarding human blood and circulatory system

• Persons with blood group AB can receive blood from any person with any blood group

• Calcium ions play an important role in blood clotting

• Angina is acute chest pain when enough oxygen does not reach the brain

• In a myogenic heart the normal activities are regulated intrinsically

• In a myogenic heart the normal activities are regulated intrinsically

In a cardiac cycle, if the stoke volume is 70 ml and heart rate is 72 beats/minute, then cardiac output is

• 142 ml/minute

• 72 ml/minute

• 1070 ml/minute

• 70 ml/minute

• 70 ml/minute

The granulocytes which secretes histamine, serotonin and heparin are

• Neutrophilss

• Basophils

• Eosinophils

• Lymphocytes

• Lymphocytes

Match the Column-I with Column-II

Column I	Column II
A. P-wave	(i) Depolarisation of ventricles
B. QRS complex	(ii) Repolarisation of ventricles
C. T-wave	(iii) Coronary ischemia
D. Reduction in the size of T-wave	(iv) Depolarisation of atria (v) Repolarisation of atria

Select the correct option.

• A - (iv); B - (i); C - (ii); D - (v)

• A - (ii); B - (i); C - (v); D - (iii)

• A - (ii); B - (iii); C - (v); D - (iv)

• A - (iv); B - (i); C - (ii); D - (iii)

217.

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

• 75 beats per minute

• 100 beats per minute

• 125 beats per minute

• 50 beats per minute

The name of the pace maker of the heart is

• lymph node

• SA node

• juxtaglomerular apparatus

• semilunar valve