Skin+-+RW

=what does the skin do= =What is the epidermis= =How the skin produces hair= =How your body keeps warm= =How many skin cells are in the human body= =Reference=

introduction-all of the human body relies on the skin and its function.The epidermis is the layer thats on the outside that you can see.the dermis is the second layer that is thick and strong and gives you your senses.your body keeps warm by the subcutaneous layer it has a cell that tells the brain.

chapter 1-The biggest organ in your body is the skin cell.your skin is very important.The skin protects everything in your body.Without skin,peoples bone,muscles and organs would be hanging out all over the place.skin holds everything in place.skin allows us to have a sense of touch.the skin helps keep our bodies at the right tempature.

The thickness of skin also varies from location to location on an organism. In humans for example, the skin located under the eyes and around the eyelids is the thinnest skin in the body at 0.5 mm thick, and is one of the first areas to show signs of aging such as "crows feet" and wrinkles. The skin on the palms and the soles of the feet is 4 mm thick and the thickest skin in the body. The speed and quality of wound healing in skin is promoted by the reception of estrogen.

chapter 2-The skin is made up of three layers.The layer on the outside layer is the epidermis.The epidermis is the part of the skin that you can see.The skin is the largest and fastest growing organ.Theres billions of skin cells,thats why the skin weighs seven pounds.Skin cell stack themselves together like tiny bricks to make a protective wall around your body.The epidermis is mostly made up of dead skin cells.Millions of these cells break off every day.

underneath the epidermis is the dermis. The dermis is the strong and thick layer that does many things.the dermis is the layer that lets the body sweat.The nerves in this layer helps you feel objects.Cells in the dermis helps secrete oil that keeps skin soft and waterproof. Sweat comes from your pores from the skin.

chapter 3- The third layer of the body is the subcutaneous. It is mostly made up of fat and helps your body stay warm and absorb shocks. so if you bang into something or fall down,the subcutaneous layer also helps hold your skin to all the tissue underneath it.This layer is where you will find the start of hair.

The human bodys temperature with always be 37 celsius no matter what the surroundings are. The hypothalamus is the temperature telling the centre of the brain. It contains receptors which are sensitive to the temperature of the blood flowing through the brain.skin sends messages to the hypothalamus about the temperature of the skin surface.

chapter 4-Each hair on your body grows out of a tiny cell called a follicle. Every follicle has its tubes way down in the subcutaneous layer and continues up through the dermis. You have hair follicles all over your body, except on your lips,palms of your hands and the soles of your feet. you have more hair follicles in some places than others. There are more than 100,000 follicles on your head alone.

Your hair follicles rely on your sebaceous glands to bring on the shine. The sebaceous glands are microscopic exocrine glands in the skin that secrete an oily or waxy matter, called sebum. Connected to each follicle in the dermis layer is a tiny sebaceous gland that releases sebum onto the hair. This lightly coats the hair with oil giving it some shine and a little waterproofing.