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प्रश्न
Describe how the exchange of oxygen and carbon dioxide gases takes place in the lungs.
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उत्तर
At the time of respiration, the external air reaches up to the alveoli in the lungs. The oxygen in the air enters the blood vessels, which surround the alveoli. Through the network of blood vessels, oxygen is supplied to the entire body. At the same time, carbon dioxide is brought by the circulating blood into the alveoli. From here, carbon dioxide is given out of the body through exhalation. In this way, the exchange of oxygen and carbon dioxide gases takes place in the alveoli of the lungs.
संबंधित प्रश्न
The diagram below represents the simplified pathway of the circulation of blood. Study the same and answer the questions which follow:
(i) Name the blood vessels labelled 1 and 2.
(ii) State the function of blood vessels labelled 5 and 8.
(iii) What is the importance of the blood vessel labelled 6?
(iv) Which blood vessel will contain a high amount of glucose and amino acids after a meal?
(v) Draw a diagram of the different blood cells as seen in a smear of human blood.
What is meant by human circulatory system?
Why is it necessary to know the blood groups before giving transfusion?
Name the following:
The blood vessels which start from capillaries and end in capillaries.
Give reason for the following:
The arteries are deep seated in the body
Find out my partner.
| Group ‘A’ | Group ‘B’ |
| 1. Heart beats | a. 350 ml |
| 2. RBC | b. 7.4 |
| 3. WBC | c. 37°C |
| 4. Blood donation | d. 72 |
| 5. Normal body temperature | e. 50-60 lakh/mm3 |
| 6. pH of oxygenated blood | f. 5000-6000 per mm3 |
Name the organ from which oxygenated blood goes into the heart
Complete the following sentence with appropriate word:
Beside food, oxygen and waste materials, circulatory system transports ________ to various parts of the body.
State the Location: Bicuspid value
Short answer question.
Write a note on blood plasma.
