why does the hair in our body stand straight at times?

Answer 1

Happens due to Goose Bumps!

Goose bumps (AE), also called goose pimples, goose flesh (BE), chicken skin (Hawaiian Pidgin), or cutis anserina, are the bumps on a person's skin at the base of body hairs which involuntarily develop when a person is cold or experiences strong emotions like fear or awe. The reflex of producing goose bumps is known as horripilation, PLOERECTION, or the pilomotor reflex.
Goose bumps are created when tiny muscles at the base of each hair, known as ARRECTORES PILORUM, contract and PULL THE HAIR ERECT. The reflex is started by the sympathetic nervous system, which is in general responsible for many fight-or-flight responses.

Goose bumps are often a response to cold: in animals covered with fur or hair, the erect hairs trap air to create a layer of insulation.

Piloerection as a response to cold or fear is vestigial in humans; as humans retain only very little body hair, the reflex now serves no known purpose.
________ _________ ___________ __________
In humans, goose bumps are strongest on the forearms, but also occur on the legs, back, and other areas of the skin that have hair. In some people, they even occur in the face or on the head.

Answer 2

Well this phenomenon is know as goose flush or goose bumps.. it happens because of The muscles contracting making the hair to stand up.. it usually happens when one is excited or thrilled in routine.. however it can be classically observed when one feels cold.. during this time.. the hair standing tends to block the air on the skin and not allowing the relatively cold air over it to come in contact and hence trying to give a feeling of warmth.. uc..

Answer 3

The skin is our largest organ. If the skin of a typical 150-pound (68-kilogram) adult male were stretched out flat, it would cover about 2 square yards (1.7 square meters) and weigh about 9 pounds (4 kilograms). Our skin protects the network of muscles, bones, nerves, blood vessels, and everything else inside our bodies. Our eyelids have the thinnest skin, the soles of our feet the thickest.

Hair is actually a modified type of skin. Hair grows everywhere on the human body except the palms of the hands, soles of the feet, eyelids, and lips. Hair grows more quickly in summer than winter, and more slowly at night than during the day.

Like hair, nails are a type of modified skin — and they're not just for beauty. Nails protect the sensitive tips of our fingers and toes. Human nails are not necessary for living, but they do provide support for the tips of the fingers and toes, protect them from injury, and aid in picking up small objects. Without them, we'd have a hard time scratching an itch or untying a knot. Nails can be an indicator of a person's general health, and illness often affects their growth.

Answer 4

it may be due to the sensitive nerves i.e neurons in our body reacts when it recieves signals from the brain
it reacts so because it symbolises that some abnormal sense has been felt by our body and that which it was known by our brain...........
when this happens, our hair which is just above these nerves can quickly feels the sense which thereby leads to a chemical reactions and finally ends up with the hair standing up straight......when it recieves chemical changes at the root of our body hair, my dear friend...

Answer 5

because of the tissue inside the skin comes up and causes the hair to stand straight

Answer 6

Because muscles tighten in our bodies causing the hair to stand on end when skin and muscles contract around the pore they are sprouted from. Or you put that fork in the electrical socket again.

Answer 7

When you feel cold the hair present on your body erects and traps air and thus acts as an insulator. As air is a bad conductor of heat, it doesn't let the inner heat of body to fuse out. And thus keeps the body warm.

Answer 8

Just as our Secret organs Stands straight at times due to Excitment

Answer 9

the body want to maintain homeostasis (a constant environment) so if it gets cold, the hypothalmus (in the brain) tells the muscles to contract through combustion which produces a heating effect.. this is why u shiver wen its cold. So wen the muscles contract, it tightents the pores where the hair comes out of, cusing it to stand up

Answer 10

Because a stimulus, like fear or cold sensation will simulate the "erector pilli" found at the base of hair follicles which pushes the hair up. It is called in common lingo as "gooseflesh".