BIOLOGY CH20 Organ Systems in Animals — Science STD 9 — Question
Tamilnadu BoardEnglish MediumSTD 9ScienceBIOLOGY CH20 Organ Systems in Animals4 Marks
Question
Write a note on the skin.
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Answer
Skin is the outermost covering of the body. It stretches all over the body in the form of a layer.
It accounts for 15% of an adult’s human body weight. There are many structures and glands derived from the skin. It eliminates metabolic wastes through perspiration.
The human body functions normally at a temperature of about 37 C.
When it gets hot sweat glands to start secreting sweat, which contains water with small amounts of other chemicals like ammonia, urea, lactic acid and salts (mainly sodium chloride).
The sweat passes through the pores in the skin and gets evaporated.
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