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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 human heart in one phase of its function. Study the diagram carefully and answer the questions that follow:
(i) Name the phase.
(ii) Which part of the heart is contracting in this phase? Give a reason to support your answer.
(iii) Name the parts labelled 1 to 4.
(iv) What type of blood flows through ‘2’?
(v) State the function of the part numbered ‘5’.
(vi) Name the membrane that covers the heart.
Name the following:
The blood vessel which supplies blood to the liver.
Give appropriate biological or technical terms for the following :
The complex consisting of a DNA strand and a core of histones
What is meant by human circulatory system? Name the organs of the circulatory system in humans.
Given below is a certain structure, write its chief functional activity.
Bone marrow - ______.
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 |
How do you account for the following difference?
The left ventricle has thicker walls than the right ventricle.
Choose the correct answer:
English physician who discovered blood circulation was ___________
Blood is produced in the bone marrow.
Analogy
Arteries : Carry blood from the heart:: _________ :carry blood to the heart.
