Function of Skin

Skin is the largest organ of the body. It serves several functions.

The skin provides protection against mechanical injury, microbial invasion, dehydration, UV rays, chemical attacks etc.

Skin prevents entry of harmful substances and pathogens into the body.

The skin serves as a sense organ and can perceive touch, pain, pressure and heat.

The skin prevents loss of heat in cold weather and facilitates loss of heat in hot weather.In humans, hypothalamus acts as thermostat.

There are two types of animals based on temperature regulation namely, endotherms and ectotherms.

Animals which maintain a fairly constant body temperature (birds and mammals) are called endotherms.

hose organisms which have a variable body temperature are called ectotherms.

Skin stores excess food in the form of fat contained in special cells called adipocytes. Fat in the subcutaneous layer acts as insulating substance and food reserve.

Skin removes excess water and metabolic waste through sweat. Sweat glands extract more water from blood. Sweating regulates body temperature as evaporation of water cools the body.

The skin facilitates the process of excretion by sweating. Sweat consists of metabolic wastes like water, lactate, urea, sodium, potassium, calcium and magnesium etc.

The skin is capable of synthesizing vitamin D in the presence of sun-shine.

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  • Q1

    Name the secretion produced by the skin which prevents it from drying out.

    Marks:1
    Answer:

    The Sebum produced by sebaceous glands in the skin prevents it from drying out.

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  • Q2

    Name the fat cells contained beneath the dermis of the skin.

    Marks:1
    Answer:

    Adipocytes are the fat cells contained beneath the dermis of skin.

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  • Q3

    Name the organ that prevents the entry of ultraviolet rays into the body.

    Marks:1
    Answer:

    Skin prevents the entry of ultraviolet rays into the body.

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  • Q4

    Name the organ of the body that is referred to as the”Jack of all Trades”.

    Marks:1
    Answer:

    Skin is referred to as the “Jack of All Trades”.

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  • Q5

    Name the vitamin synthesised in the presence of sunlight.

    Marks:1
    Answer:

    Vitamin D is synthesised in the presence of sunlight.

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