Hello
During each heart beat ventricle pump about 70 ml of blood and this is called stroke volume. So correct option is a) 70ml, stroke volume
The amount of blood pumped in each heart beat is called cardiac out put. In one minute 72 × 70ml = 5040 ml
When heart beat increases , it is called as high blood pressure.
Question : Tachycardia is a condition characterized by
Option 1: heart-rate decreases from the normal
Option 2: heart-rate increases from the normal
Option 3: heart-beat stops
Option 4: heart fails to pump
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