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प्रश्न
Describe the function of the heart.
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उत्तर १
- The heart contains four chambers: two upper chambers, known as atria, and two lower chambers, known as ventricles. The left and right chambers are entirely divided to prevent the mixing of oxygen- and carbon dioxide-rich blood.
- The vena cava (main vein) transports deoxygenated blood from all over the body to the right atrium. This blood is pumped from the right atrium to the right ventricle, which subsequently delivers it to the pulmonary artery, which carries blood to the lungs for oxygenation.
- The left atrium receives oxygenated blood via pulmonary veins (2 each from the right and left lungs). The blood is subsequently pumped into the left ventricle, which in turn pumps it into the aorta (main artery), where it is distributed throughout the body.
The circulation of blood can be illustrated by the following flow chart:
उत्तर २
- The heart circulates pure blood throughout the body and into the sea.
- The blood in the body is mixed and circulated to the lungs, heart and liver for purification.
- The heart transports water and other useful medicines to all the seas through the blood.
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संबंधित प्रश्न
Name the following:
The phase of the cardiac cycle in which the auricles contract.
Give reason for the following:
Atrial wall is less muscular than the ventricular wall.
Given diagram shows a simple diagram of the circulation of blood in a mamma showing the
main blood vessels, the heart, lungs and body tissues. The blood vessel, labelled 6, contains
deoxygenated blood and the valve leading to it has three semi-lunar pockets.
(a) Name the blood vessels and organs marked by numbers 1 to 8.
(b) What is meant by the term ‘double circulation’ of blood in mammals?
(c) what is diastole?
[There is an “error” in the diagram. According to the usual practice the pulmonary (lung)
circulation is shown upward and the systemic downward, but here it is reversed].
pH of oxygenated blood is ______.
Fill in the blanks with suitable words given below:
The blood loaded with carbon dioxide from the body comes into the ______ of the heart.
Find the odd one out, giving reason.
Given below is the simplified pathway of the circulatory system:
(i) Name the blood vessels marked 1 to 8.
(ii) Name the chamber of the heart which:
(a) Receives blood from ‘1’.
(b) Pumps blood into blood vessel ‘8’.
(iii) Mention two structural differences between blood vessels ‘7’ and ‘2’.
Match the following.
| Group A | Group B |
| (1) Lungs | (a) Circulation |
| (2) Stomach | (b) Respiration |
| (3) Heart | (c) Co-ordination |
| (4) Brain | (d) Digestion |
Identify the INCORRECT match
______ is an agranulocyte.
