Question

explain how skin works as sense organ

Answer 1

There are 5 types of senses in human being - Vision (Eye), Hearing (Ear), Taste (Tongue), Touch (Skin), and Smell (Nose)

Skin is the largest sensory organ of human body. It covers astonishingly 20 sq.ft  of area. Skin assists in variety of functions such as protection from germs, sensations of touch, heat, cold, and also acts as waterproof barrier.

Skin is made up of 3 layers
1. Dermis
2. Hypodermis
3. Epidermis

Dermis layer contains millions of nerve endings which provides the sensory organ touch and sensation function. 

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Answer 2

Skin is the largest organ of the human body which protects human body but it also acts as sense organ. Skin has receptors which detect touch, pain, cold and heat separately.
Skin has wide network of nerve cells which detect and forward to spinal cord and brain to any change in the environment. The receptors of heat, cold, pain and touch feel any change and create nerve impulse which forwards information to spinal cord and brain and then the react accordingly.