Question

S4
Skin
1
What are the main functions of the skin?​

Answer 1

Protection

The skin functions as our first line of defense against toxins, radiation and harmful pollutants. Skin contains cells that provide immune functions to protect against infections.

Absorption

Thousands of pores on the surface of the skin can absorb vitamins, acids, water and oxygen in order to provide moisture and nourishment to our skin.

Excretion

The skin is the body’s largest waste removal system. Toxins are released through the sweat glands and pores.

Secretion

The skin secretes sebum, a mixture of oils that keeps the skin soft and supple. The layer of sebum on the outermost layer of the skin is known as the acid mantle.

Regulation

The skin regulates the body’s temperature by sweating; when water from sweat on the skin evaporates it gives off heat and cools the body.

Sensation

The skin contains millions of nerve endings that transport stimuli. These nerve endings allow humans to detect sensation such as heat, cold, pain and pressure.

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Answer 2

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Skin :-

It is the outermost covering of the body. It is stretched all over in the form of a layer.

Functions of skin :-

• It protects the underlying tissues from mechanical shock.
• It holds the body fluid inside and prevents excessive loss of water by evaporation.
• It prevents harmful substances or diseases causing germs from entering our body.