Question
What would be the heart rate of a person if the cardiac output is 5L, blood volume in the ventricles at the end of diastole is 100 mL and at the end of ventricular systole is 50 mL?
125 beats per minute
50 beats per minute
75 beats per minute
100 beats per minute
According to the text, 'The stroke volume multiplied by the heart rate (no. of beats per min.) gives the cardiac output'. First, calculate the Stroke Volume (SV) = End Diastolic Volume - End Systolic Volume = 100 mL - 50 mL = 50 mL. Then, using the formula Cardiac Output = SV × Heart Rate, we get 5000 mL = 50 mL × HR. Therefore, HR = 5000 / 50 = 100 beats per minute .
This question aligns with the NEET BIOLOGY syllabus, specifically targeting concepts from Body Fluids and Circulation. Mastering this topic is crucial for scoring well in the upcoming medical entrance examinations. Solving conceptually related problems will help you understand the nuances of these concepts and improve your problem-solving speed.
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