Primer of Hygiene

Cover Primer of Hygiene
Primer of Hygiene
John W John Woodside Ritchie
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The inner part of this coat is alive, but the part which comes in contact with the outside world is dead and keeps falling away in dry scales.
The structure of the skin. The skin is com- posed of an outer layer called the epidermis and an inner layer called the dermis. The epidermis has no 7 1 PRIMER OF HYGIENE bair epidermis blood vessels in it, but its inner part is alive and keeps growing to take the place of the outer part that is all the time dying and falling away. Every- where in the ski
...n are little sweat glands that pour out the sweat on the surface of the skin.
The skin a regulator of the body heat. The temperature of the healthy body, winter and sum- mer, is about 98. 6 degrees. It remains the same be- cause the skin regulates the heat of the body. This it does in two ways. When we are hot, the blood-vessels in the skin open up and allow the blood to come to the outside of the body, where it can be cooled. When we are cold, the ves- sels in the skin close up and keep the blood in the warm inner parts of the body.


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