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प्रश्न
Describe the circulatory system of humans.
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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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संबंधित प्रश्न
MULTIPLE CHOICE TYPE:
(Select the most appropriate option)
The valve present between the right atrium and the right ventricle is the
(a) tricuspid valve
(b) bicuspid valve
(c) semi-lunar valve
(d) mitral valve
Given below is a certain structure, write its chief functional activity.
Erythrocytes - ______.
The table below is designed to indicate the transport of certain substance in our body. Fill in the
blanks with suitable answers.
| Substance | From | To |
| Lungs | Whole body | |
| Carbon dioxide | ||
| Urea | ||
| Digested carbohydrates |
Intestines | |
| Target organs |
Give reason for the following:
Atrial wall is less muscular than the ventricular wall.
Given below is a highly schematic diagram of the human blood circulatory system.
 |
- Which part (state the number) represents the heart? Give reason in support of your answer.
- Which numbers represent the following, respectively?
Aorta Superior vena cava Hepatic portal vein Renal Vein Pulmonary artery Stomach
Match the statements in Column A with those in Column B
| Column A | Column B | ||
| 1 | Heart | a | Movement of materials |
| 2 | Food and oxygen | b | Channels for transport in man |
| 3 | Carrier of oxygen | c | A living pump |
| 4 | Circulation | d | Materials needed by every living being |
| 5 | Arteries and veins | e | Red blood cells |
Define the Veins.
Name the main parts of the circulatory system.
Name the systems that carry out the different functions of the body.
Which of the following cells are produced from reticulocytes?
