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प्रश्न
Answer in only one sentence of the following question:
Mention the role of the pacemaker in human heart.
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.
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संबंधित प्रश्न
Which of the following is mesodermal is the origin?
Where does blood absorb oxygen?
Fill in the blank with suitable word given below:
The blood loaded with carbon dioxide from the body comes into the __________ of the heart.
Choose the correct answer:
The E.C.G. is used to detect ____________
How are arteries and veins structurally different from one another?
For which of the following reason the left ventricle of human heart has its wall thicker than the right ventricle?
Match the items given in Column I (Valves) with those in Column II (Location) and select the correct option.
| Column I | Column II | ||
| i. | Tricuspid valve | a. | Between left atrium and left ventricle |
| ii. | Bicuspid valve | b. | Between right ventricle . and pulmonary artery. |
| iii. | Semilunar valve | c. | Between right atrium and right ventricle |
Analogy:
Skeletal muscle: Muscle of arm.
Cardiac muscle: ______.
Valves are present in ______.
Give the exact location of the pericardium.
