Multiple Choice Questions on the Heart - Cardiac Output

Heart - Systole

Source

Introduction-Heart and Cardiac Output

Heart is a muscular organ which beats throughout your life without your knowledge. It is about the size of your fist located within the chest cavity. Heart receives deoxygenated blood from different parts of the body through inferior and superior vena cava and pumps it to lungs for purification through pulmonary trunk. The purified blood returns to the heart through pulmonary veins and it is again pumped to different parts of the body through aorta. A cardiac cycle consists of alternating periods of systole and diastole.

The volume of blood ejected with each heart beat is:

Stroke volume

Cardiac output

End diastolic volume

End systolic volume

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Answer: Stroke volume

Difference between the end diastolic and end systolic volume is:

Stroke volume

Cardiac output

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Answer: Stroke volume

Did you know?

  • End diastolic volume is an important determinant of cardiac function

  • Increased sympathetic activity directly enhances the pacemaker tissue activity, increases heart muscle contractility and results in venous constriction.

  • Sympathetic stimulation and epinephrine increase the concentration of intracellular Ca2+ thereby increasing the cardiac contractility and stroke volume

The sum of all the stroke volumes ejected from the heart over a one minute period is:

Cardiac output

End diastolic volume

End systolic volume

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Answer: Cardiac output

Which equation best describes Cardiac Output?

Cardiac output= heart rate X stroke volume

Cardiac output= heart rate + stroke volume

Cardiac output= heart rate - stroke volume

Cardiac output= heart rate X end diastolic volume

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Answer: Cardiac output= heart rate X stroke volume

The amount of blood in the ventricles at the end of diastolic filling is known as:

Cardiac output

End diastolic volume

End systolic volume

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Answer: End diastolic volume

Which branch of the autonomic nervous system increases the heart rate, stroke volume and venous return to the heart?

Sympathetic activity

Parasympathetic activity

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Answer: Sympathetic activity

Heart - Diastole

Source

What component of cardiac output is affected by an increase in intracellular Ca2+ ?

Stroke volume

Heart rate

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Answer: Stroke volume

The period of cardiac cycle during which the ventricles are filled with blood is:

Systole

Diastole

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Answer: Diastole

The difference between a person’s maximum cardiac output and resting cardiac output is called the:

Cardiac reserve

Ejection Fraction

Preload

Afterload

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Answer: Cardiac reserve

The magnitude of the maximal (end-diastolic) ventricular volume or the end-diastolic pressure stretching the ventricles is:

Cardiac reserve

Ejection Fraction

Preload

Afterload

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Answer: Preload

The pressure against which the ventricle ejects blood is:

Cardiac reserve

Ejection Fraction

Preload

Afterload

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Answer: Afterload

Human Pumping Heart

Source

Stroke volume divided by the end-diastolic volume is:

Cardiac reserve

Ejection Fraction

Preload

Afterload

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Answer: Ejection Fraction

Normal range of ejection fraction is:

45 ± 8 per cent

65 ± 8 per cent

85 ± 8 per cent

105 ± 8 per cent

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Answer: 65 ± 8 per cent

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thumbi7 3 years ago from India Author

Hi manatita44

Thanks for the visit


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manatita44 3 years ago from london

Lot of effort here. I had forgotton a lot

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