Question

If the end systolic volume of heart is 50 ml &
end diastolic volume is 100 ml. cardiac output
is 5000 ml what will be heart rate?
O 50
O
100
O
75
O O
25​

Answer 1

Answer : 100 beats/minute

Explanation :-

1. Atrial Systole : Contraction of atria is stimulated by sinoatrial node, blood moves into ventricles as the bicuspid and tricuspid valves open.

2. Ventricular Systole : Contraction of ventricle is stimulated by atrio-ventricular node, closure if bicuspid and tricuspid valves produces a sound “lub”, on completion of the ventricular contraction, the blood moves into the pulmonary trunk and aorta on the opening of semilunar valves.

3. Ventricular diastole : Relaxation of the ventricles, closure of the semilunar valves, leading to the production of a sound “dub”.

- Cardiac output : Blood pumped by each ventricle per minute.

- Cardiac output = 5000 ml = 5 litre

- End systolic volume of heart = 50 ml

- End diastolic volume of heart = 100 ml

- Stroke volume = 100 ml - 50 ml = 50 ml

- Cardiac output = Heart rate × Stroke volume

- 5000 ml = Heart rate × 50 ml

- Heart rate = 100 beats/minute

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