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Question
Answer in only one sentence of the following question:
Mention the role of the pacemaker in human heart.
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Solution
- The Sinu-auricular (SA) node is the pacemaker of the heart.
- It generates wave of contraction which spread along the wall of atria and bring about their contraction.
- It has highest degree of rhythmicity and is the first to originate the cardiac impulses and determine the rate of heart beat.
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Multiple Choice Questions
The beating of the heart of man is heart on the left side, because:
______ is known as pacemaker of heart.
Which of the following has thickest wall?
Mention the artery which supplies blood to the heart muscle.
Calculate the heart rate of a person if the cardiac output is SL, blood volume in the ventricles at the end of diastole is 100 mL and at the end of ventricular systole is 50mL.
Assertion: Human heart does not allow the mixing of oxygen to reach blood with carbon dioxide to reach the blood.
Reason: Human heart has different chambers.
Explain the term Chordae tendinae.
Write the exact location of the following:
Heart
