Question

structure anf functions of skin​

Answer 1

Explanation:

Skin structure and function

The skin is an organ that provides the outer protective wrapping for all the body parts. It is the largest organ in the body. It is a waterproof, airtight and flexible barrier between the environment and internal organs. It keeps the internal environment of our body stable. The skin is divided into 3 layers, the epidermis, the dermis and the subcutaneous layer.

The diagram below shows how the different layers and parts of the skin are arranged.

Skin Structure and Function

Image reproduced with permission of Department of Dermatology St Vincent’s Hospital Melbourne

Epidermis

The epidermis is the outer layer of the skin. It is a mosaic of cells glued together and its thickness depends on the location on the body. On the palms and soles the epidermis is thick, flexible and resists mechanical injury. On the eyelids it is very thin and allows maximum movement. The epidermis prevents loss of water and body fluids, resists mechanical and chemical injury and protects against bacteria, viruses and parasite infections. The pigment in the epidermis plays an important role in protecting the skin from ultraviolet radiation.

Answer 2

⭐Structure of the Skin⭐

The principle components of the human skin are as follows.

A. Skin proper → cornified,granular,and germinative layers.

B. Derivatives of the Skin → Hairs,nails,mammary glands, sweat glands, sebaceous glands.

⭐Functions of skin⭐

The skin serves a number of important functions are as follows:

1.Protection→ Protection is the primary function of the Skin. It affords protection in four different ways

(i) It protects the underlying tissues from mechanical shocks.

(ii) It holds the body fluids inside and prevents excessive loss of water by evaporation.

(iii) It prevents the entry of harmful substances or disease.

(iv) It protects the body against excess ultraviolet light which is potentially very harmful.

2. Sensation → Our skin seves as a sense organ for touch, pain, pressure, heat, etc.

3. Temperature regulation→ The skin prevents loss of heat in cold weather and facilitates the loss of heat in hot weather.

4. Storage of food → The skin stores reserve food in the form of a layer of fat contained in special cell.

5. Excretion → The skin assists in the process of excretion ( through eliminating water ), salts and, to a very limited extent, urea.

6. Grip → The skin on our fingers and palms forms ridges and grooves which provide a more efficient grip.

7. Synthesis of Vitamin D → The skin can synthesis vitamin d when exposed to sunshine. In fact too much sunshine may cause tanning and other ill-effects including even skin cancer.