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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.
The nearest organ to which the heart supplies oxygenated blood is:
The valve which prevents back flow of blood in the veins and lymph vessels ______.
Given below is a highly schematic diagram of the human blood circulatory system.
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- 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
Explain the difference.
Arteries and veins.
Fill in the blanks with suitable words given below:
The liquid part of coagulated blood is known as ______.
Why is circulatory system also known as transport system?
Which of the following is the main site of erythropoiesis in adults?
Which component of the haemoglobin molecule combines with the oxygen molecule to form oxyhaemoglobin?
Name these:
Three components of circulatory system.
