28.
What is epidermis? List two functions of epidermis.
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Answer:
epidermis means the outermost layer of skin
two function of epidermis are
provide waterproof barrier and creates our skin tone
it forms a boundary between the plants and the external environment
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29
Question :
What is epidermis? List functions of epidermis.
Answer :
The epidermis is the outer and the thinner part of the skin.
- It is formed of stratified epithelium.
- It is joined layer after layer.
- In some places, the epidermis is thick and hard such as on the Palms, soles and on the heels.
It has three sublayers depthwise :
- Outermost cornified layer
- Middle granular layer
- Inner malpighian layer.
❇ The outermost cornified layer is composed of flattened dead cells performing protective function.
- These cells are made up of a fibrous structural protein called Keratin which are found in our nails, hairs.
❇ The middle granular layer is a very thin middle layer.
- It consists of two or three flattened calls which gives the way to the outermost cornified layer.
❇ The malpighian layer is the innermost layer and region of the epidermis.
- It is also called as germinative layer.
- Its cells actively divide and produce new cells.
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