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प्रश्न
Describe the circulatory system of humans.
सविस्तर उत्तर
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उत्तर
- The circulatory system in human beings consists of the heart, blood vessels (arteries, veins and capillaries) and blood.
- Blood circulates throughout the body in blood vessels by the pumping action of the heart.
- The impure blood is carried by veins from all parts of the body to the heart. The heart pumps it into the lungs, where blood is oxygenated and carried back to the heart.
- From the heart, the oxygenated (pure) blood is pumped to all parts of the body through arteries. Thus, the circulatory system forms the transport system carrying food, oxygen, waste products, nutrients, etc. throughout the body.
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पाठ 8: Circulatory System - Exercises [पृष्ठ ११९]
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संबंधित प्रश्न
Aqueous humour, Vitreous humour, lris, Central canal
Given below is a certain structure, write its chief functional activity.
Bone marrow - ______.
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 |
Explain with reasons.
Human blood is red coloured.
True or false:
The four blood groups in human beings are A, B, AB and AO
All the waste products of the body are excreted through the circulatory system.
______ prevent blood clotting.
Which of the following is TRUE regarding closed circulatory system?
Which of the following is the main site of erythropoiesis in adults?
Name these:
Three components of circulatory system.
