SATHEE: Body Fluids and Circulation Question 52

Body Fluids and Circulation Question 52

52. What would be the heart rate of a person if the cardiac output is $5 L$ , blood volume in the ventricles at the end of diastole is $100 m L$ and at the end of ventricular systole is $50 m L$ ?

(a) 50 beats per minute

(b) 75 beats per minute

(d) 125 beats per minute

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Answer : c

Hints & Solutions

(c) Cardiac output is the product of the heart rate (HR), or the number of heart beats per minute (bpm), and the stroke volume (SV), which is the volume of blood pumped from the ventricle per beat; thus,

Cardiac output $=$ stroke volume $\times$ Heart rate As per the given information,

Cardiac output $= 5 L$ or $5000 m l$

Blood volume in ventricles at the end of diastole $= 100 m l$

Blood volume in ventricles at the end of systole $= 50 m l$

$∴$ Stroke volume $= 100 - 50$

$= 50 m l .$

So, $5000 m l = 50 m l \times$ Heart rate

So, Heart rate $= 100$ beats per minute.

Body Fluids and Circulation Question 52

52. What would be the heart rate of a person if the cardiac output is $5 L$ , blood volume in the ventricles at the end of diastole is $100 m L$ and at the end of ventricular systole is $50 m L$ ?

Answer : c

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Body Fluids and Circulation Question 52

52. 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 100mL and at the end of ventricular systole is 50mL ?

Answer : c

Hints & Solutions

Engineering Preparation

Medical Preparation

NCERT Books & Solutions

Important Resources

Other Resources

Syllabus

Test Platform

Sample Mock Test

Mentorship

NCERT Exercise Video Solution

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52. What would be the heart rate of a person if the cardiac output is $5 L$ , blood volume in the ventricles at the end of diastole is $100 m L$ and at the end of ventricular systole is $50 m L$ ?