Question

1) Describe double circulation in human beings. Why is it necessary?

2) What are the components of the transport system in human beings? What are the functions of these components?

Class 10 Science​

Answer 1

Solution:

1)

In mammals and birds the blood goes through the heart twice during each cycle. This is known as double circulation. Deoxygenated blood which enters right auricle and then it enters the right ventricle from where it is pumped to lungs for oxygenation. From lungs after oxygenation it comes to left auricle and then enters left ventricle from where it is pumped to various parts of body.

Such system of circulation does not allow mixing of oxygenated and deoxygenated blood which allows efficient supply of oxygen to the body.

2)

The components of human transport system include:

• Heart- receives and pumps the blood.

• Arteries- carry oxygenated blood away from the heart to various organs.

• Veins- Bring back blood to heart.

• Capillaries- exchange of various materials and gases between blood and tissues.

Answer 2

Answer:

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Explanation:

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