Page 47 - Biology_Form_3

Coordination in animals

Questions responds to pain, pressure, touch, heat,
(a) Which sense organs do you see? and cold sensations. Structurally, the skin
(b) Describe the functions of the sense consists of two main layers namely; the
organs you have seen. epidermis and the dermis as shown in
Figure 2.15. The epidermis is the outermost
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layer of the skin consisting of three layers
The mammalian skin called malpighian, granular and cornified

Task 2.8 layers. The malpighian layer consists of
living and dividing cells. Granular layer
Search from the library and internet
sources the information about the contains living cells on its inner surface
close to the Malpighian layer. The outer
structure and functions of the human
skin. Write short notes about the searched layer is composed of dead cells which
eventually form the cornified layer. The
information.
cornified layer form the outermost layer

The skin forms the outer covering of the of the skin. This layer is formed by dead
body of the living organism. It is the largest horny cells. It prevents the entry of germs
organ in the body. It protects the body and into the body and also reduces water loss.
helps to regulate body temperature, and

Malpighian layer Hair shaft Sweat gland pore
Sebaceous
Granular layer gland Sweat duct
Cornified layer
Heat receptor Epidermis

Cold receptor

Nerve Dermis

Pressure receptor

Subcutaneous Subcutaneous
fat layer

Hair erector Venule Sweat gland Arteriole
muscle
Figure 2.15: Cross section of human skin

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