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NEET · Biology · STD 11 - 15. Body fluids and criculations
Which would be the heart rate of a person if the cardiac output is \(5\; \mathrm{L},\) blood volume in the ventricles at the end of diastole is \(100 \;\mathrm{mL}\) and at the end of ventricular systole is \(50\; \mathrm{mL} ?\)
- A \(50\) beats per minute
- B \(75\) beats per minute
- C \(100\) beats per minute
- D \(125\) beats per minute
Answer & Solution
Correct Answer
(C) \(100\) beats per minute
Step-by-step Solution
Detailed explanation
To find the heart rate, we first determine the Stroke Volume (SV), which is the amount of blood pumped per beat. This is calculated by subtracting the volume at the end of systole (50 mL) from the volume at the end of diastole (100 mL), resulting in \(SV = 50 \text{ mL}\). Since Cardiac Output (CO) is the total blood pumped per minute \(5 \text{ L}\) or \(5000 \text{ mL}\), we use the formula \(\text{CO} = \text{SV} \times \text{Heart Rate}\). By dividing \(5000 \text{ mL}\) by \(50 \text{ mL}\), we arrive at a heart rate of 100 beats per minute.
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