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प्रश्न
Answer in only one sentence of the following question:
Mention the role of the pacemaker in human heart.
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उत्तर
- 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.
APPEARS IN
संबंधित प्रश्न
Name of the valve between the left atrium and left ventricle and give its significance.
Explain the following:
Why is the SA node called the pace-maker of the heart?
Select the odd one in the following:
Artery, Vein, Capillary, Nerve.
Choose the correct answer:
In mammals the opening of post caval in the right auricle is guarded by _________
The diagram given below represents the human heart in one phase of its activity. Study the same and then answer the question that follow:
How many valves are closed in this phase?
Given alongside is a highly diagrammatic sketch of the internal structure of the human heart:
(i) Name the parts numbered 1-11.
(ii) What is the main difference in the quality of blood contained in parts 6 and 7?
Pick out the odd one.
heart, legs, brain, kidney
______ are muscular ridges at the inner surface of ventricles.
______ externally separates ventricles from each other.
______ guards the opening of inferior vena cava.
