How does or what are the duties of nail and hair in human body to preserve human being life?

Question

I Mean if human being have no spontenous outward show of hair and nail will they hurt humans life or daily routine ?

Answer 1

hair protects our body by
1.prevents dust and microbes entering our body(hair in the nose)
2.when we fall, they stand upright and prevents maximum injury.
nails are most useful in ancient days for
1.piercing prey body
2.protection from enemies
3.strength to toes and fingers.

Answer 2

Hair is a natural helmet for head to protect the brain and nail is a helmet for fingers and toes as they are always moving/working.

Answer 3

If human being not have nails and hair then humans will look somewhat like animals

Answer 4

Hair:
The hair on our heads isn't just there for looks. It keeps us warm by preserving heat. The hair in our nose, ears, and around our eyes protects these sensitive areas of the body from dust and other small particles. Eyebrows and eyelashes protect our eyes by decreasing the amount of light and particles that go into them. The fine hair that covers our bodies provides warmth and protects our skin. Hair also cushions the body against injury.


Human hair consists of the hair shaft, which projects from the skin's surface, and the root, a soft thickened bulb at the base of the hair embedded in the skin. The root ends in the hair bulb. The hair bulb sits in a sac-like pit in the skin called the follicle, from which the hair grows.

At the bottom of the follicle is the papilla, where hair growth actually takes place. The papilla contains an artery that nourishes the root of the hair. As cells multiply and produce keratin to harden the structure, they are pushed up the follicle and through the skin's surface as a shaft of hair. Each hair has three layers: the medulla at the center, which is soft; the cortex, which surrounds the medulla and is the main part of the hair; and the cuticle, the hard outer layer that protects the shaft.

Hair grows by forming new cells at the base of the root. These cells multiply to form a rod of tissue in the skin. The rods of cells move upward through the skin as new cells form beneath them. As they move up, they are cut off from their supply of nourishment and start to form a hard protein called keratin in a process called keratinization (pronounced: ker-uh-tuh-nuh-zay-shun). As this process occurs, the hair cells die. The dead cells and keratin form the shaft of the hair.

Each hair grows about 1/4 inch (about 6 millimeters) every month and keeps on growing for up to 6 years. The hair then falls out and another grows in its place. The length of a person's hair depends on the length of the growing phase of the follicle. Follicles are active for 2 to 6 years; they rest for about 3 months after that. A person becomes bald if the scalp follicles become inactive and no longer produce new hair. Thick hair grows out of large follicles; narrow follicles produce thin hair.

The color of a person's hair is determined by the amount and distribution of melanin in the cortex of each hair (the same melanin that's found in the epidermis). Hair also contains a yellow-red pigment; people who have blonde or red hair have only a small amount of melanin in their hair. Hair becomes gray when people age because pigment no longer forms.


Nails:
Nails grow out of deep folds in the skin of the fingers and toes. As epidermal cells below the nail root move up to the surface of the skin, they increase in number, and those closest to the nail root become flattened and pressed tightly together. Each cell is transformed into a thin plate; these plates are piled in layers to form the nail. As with hair, nails are formed by keratinization. When the nail cells accumulate, the nail is pushed forward.

The skin below the nail is called the matrix. The larger part of the nail, the nail plate, looks pink because of the network of tiny blood vessels in the underlying dermis. The whitish crescent-shaped area at the base of the nail is called the lunula.

Fingernails grow about three or four times as quickly as toenails. Like hair, nails grow more rapidly in summer than in winter. If a nail is torn off, it will regrow if the matrix is not severely injured. White spots on the nail are sometimes due to temporary changes in growth rate.

Answer 5

Nails and hair r used to increase our beauty. withou hair nail we will be a ghost like madona.

Answer 6

as others said, i will also reply the same.
hair protects the brain & cranial cavity.
nail helps in balancing the weight of the fingers&toes & also helps us as a defence material
happy monkey