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Question
Answer in only one sentence of the following question:
Mention the role of the pacemaker in human heart.
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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RELATED QUESTIONS
What are the components of the transport system in human beings? What are the functions of these components?
Fill in the blank with suitable word given below:
The two lower chambers of the heart are called ___________.
Select the odd one in the following:
Artery, Vein, Capillary, Nerve.
Choose the Odd One Out:
Column 2 is a list of items related to ideas in Column 1. Match the term in Column 2 with the suitable idea given in Column 1.
| Column 1 | Column 2 |
| (i) Superior vena cava | (a) Collect deoxygenated blood from the wall of the heart. |
| (ii) Inferior vena cava | (b) Carry oxygenated blood to heart muscle. |
| (iii) Pulmonary vein | (c) Collects deoxygenated blood from upper part. |
| (iv) Coronary veins | (d) Collects deoxygenated blood from lower parts. |
| (v) Coronary artery | (e) Brings oxygenated blood from lungs. |
| (vi) Aorta | (f) Large artery |
| (vii) Heart attack | (g) Large vein |
| (viii) Blood Pressure | (h) Oxygenated blood |
| (ix) Tricuspid valve | (i) Sphygmomanometer |
| (x) Bicuspid valve | (j) Allows blood flow from right auricle to right ventricle. |
| (xi) Contraction and relaxation of heart | (k) Blocking of coronary arteries. |
| (l) Cardiac muscle. | |
| (m) Allows blood flow from left auricle to left ventricle. | |
| (n) Allows blood flow from right ventricle of pulmonary aorta. |
Why are the walls of the left ventricle thicker than the other chambers of the heart?
How do the pulmonary artery and pulmonary vein differ in their function when compared to a normal artery and vein?
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.
Give the meaning of pacemaker.
When a person suffers from chest pain, the doctor immediately takes an ECG. Visit a doctor and get information about ECG. You may even look up an encyclopaedia or the internet.
