Question

Match the columns and choose the correct option.

	I		II
(i)	Stroke volume	(a)	70-75 action potential per minute
(ii)	Cardiac output	(b)	Ventricular repolarisation
(iii)	SAN	(c)	70 ml of blood per cardiac cycle
(iv)	P-wave	(d)	5000 ml of blood per cardiac cycle
(v)	T-wave	(e)	Atrial depolarisation

• A. i-d, ii-c, iii-a, iv-b, v-e
• B. i-a, ii-e, iii-c, iv-d, v-b
• C. i-c, ii-d, iii-a, iv-e, v-b
• D. i-c, ii-a, iii-d, iv-e, v-b
• E. i-d, ii-a, iii-b, iv-e, v-c

Answer 1

Answer: (C)

i-c, ii-d, iii-a, iv-e, v-b

(I) Stroke volume is the amount of blood delivered to heart by the veins and is about 70 ml of blood per cardiac cycle.

(ii) Cardiac output is the amount of blood pumped by left ventricle into aorta. It is about 5000 ml of blood per cardiac cycle.

(iii) SAN or Sinoatrial node is the pacemaker of heart which generates impulse or action potential for stimulating contraction of atria. It produces 70- 75 action potential per minute.

(iv) P wave in ECG represents atrial depolarisation.

(v) T wave represents in ECG represents ventricular repolarisation when ventricles return back from excited state to normal state.

So, the correct answer is 'i-c, ii-d, iii-a, iv-e, v-b'.