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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
Haemoglobin is present in ______ cells.
The diagram given below represents a section of the human heart. Answer the questions that follow :
(i) Which parts of heart are in the diastolic phase? Give a reason to support your answer.
(ii) Label the parts numbered 1 and 2 in the diagram. What type of blood flows through them?
(iii) What causes the heart sounds ‘LUBB’ and ‘DUP’?
(iv) Name the blood vessels that supply oxygenated blood to the heart muscles.
(v) Draw neat labelled diagrams of a cross section of an artery and a vein.
Name the following:
The artery which carries deoxygenated blood.
Name the following:
The kind of blood cells which can squeeze out through the walls of one category of blood vessels.
Match the items in Column ‘A’ with those in column ‘B’ Rewrite the correct matching pairs.
| Column A | Column B | ||
| (a) | SA Node | (i) | Plasma |
| (b) | Defective haemoglobin in RBC | (ii) | Serum |
| (c) | Muscle fibres located in heart | (iii) | Pacemaker |
| (d) | The liquid squeezed out of blood during clotting | (iv) | Sickle cell anaemia |
| (e) | Never tires, keep on contracting and relaxing | (v) | Purkinje fibres |
| (f) | Cardiac cycle | (vi) | Cardiac muscle |
| (g) | Liquid part of the blood without corpuscles | (vii) | 0·85 sec |
Fill in the blank:
The blood vessels which carry blood from the heart to different parts of the body are called ______.
The artificial method of filtering the blood or removing the wastes from the blood.
The stomach is like a ______.
Blood is produced in the bone marrow.
The heart is covered by ______.
