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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
Give biological reasons for the following statements:
The left ventricle of the heart has a thicker wall than the right ventricle.
The diagram given below represents a section of the human heart. Answer the questions that follow:
- Which parts of heart are in the diastolic phase? Give a reason to support your answer.
- Label the parts numbered 1 and 2 in the diagram. What type of blood flows through them?
- What causes the heart sounds ‘LUBB’ and ‘DUP’?
- Name the blood vessels that supply oxygenated blood to the heart muscles.
- Draw neat labelled diagrams of a cross section of an artery and a vein.
What is meant by human circulatory system?
How do you account for the following difference?
The walls of the right ventricle are thicker than those of the right auricle.
Fill in the blanks with suitable words given below:
The liquid part of coagulated blood is known as ______.
Multiple choice questions. Tick ( ✓ ) the correct choice:
Human heart has
Fill in the blank:
The blood vessels which carry blood from the heart to different parts of the body are called ______.
Name the Following
The enzyme which converts fibrinogen to fibrin.
Complete the following sentence with appropriate word:
The chamber of heart which pumps blood into aorta is __________.
Which component of the haemoglobin molecule combines with the oxygen molecule to form oxyhaemoglobin?
