Given below is a diagrammatic sketch of the vertical section of human skin.

(a) Label the parts numbered 1 to 9

(b) State one main function of each of the following parts:

1. Part 2.
2. Part 3.
3. Part 4.
4. Part 9.

(c) Name any one of the above parts which has at least three functions.

(d) Part 4 may add to one's good appearances or the "figure". State one example of this function which may be common to both men and women.

(a) The labels are as follows:

• 1 → Sweat-pore
• 2 → Sebaceous gland
• 3 → Sweat gland
• 4 → Fat
• 5 → Dermis
• 6 → Stratum Malpighian
• 7 → Stratum corneum
• 8 → Epidermis
• 9 → Hair

(b)

1. In the given figure, Part 2 is sebaceous gland. Its main function is to produce sebum to help keep the skin moist.
2. In the given figure, Part 3 is sweat gland. It secretes a transparent liquid (sweat) containing water and salts from the body in order to regulate body temperature.
3. In the given figure, Part 4 is Fat. The skin stores food in the form of a fat layer.
4. In the given figure, Part 9 is hair. Hair provides a touch sensation. It can be also used in the forensic study.

(c) From the above parts, the one which has atleast three functions is Sebaceous gland. Its functions are the following:

1. Protects skin
2. Produces sebum that lubricates hair and skin of mammals.
3. Sebum also protects from bacterial and fungal infections.

(d) In the given figure, Part 4 is fat. Fat accumulation in body plays a major role in determining if a person is overweight, underweight or just the right weight for both males and females. Person with balanced body weight is considered healthy. So, the right amount of fat at right places of body gives nice appearance and figure to both males and females.