MHT CET · BIOLOGY · STD 12 - 8. Respiration and Circulation

If cardiac output is 4200 ml/min, then x beats/min. is the heart rate and y is the term for pulse rate.

A x - 50, y - tachycardia
B x - 72, y - bradycardia
C x - 60, y - bradycardia
D x - 70, y - tachycardia

Verified Solution

Answer & Solution

Correct Answer

(C) x - 60, y - bradycardia

Step-by-step Solution

Detailed explanation

The heart beats 70-72 times/min during which it pumps 5040 ml blood/min (cardiac output). If cardiac output is lower than 5040 ml then heart beat will reduce. Bradycardia is condition in which heart beat will be below 60 beats/min.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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