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Science 7 Human Body Chapter 1- Bones, Muscles and Skin Test 2/14

Terms in this set (47)

What is the largest organ in the body?
Skin
*Number of Skin Layers
Three (3) - Epidermis, Dermis, and Fat Layer
*Epidermis
Outermost layer of skin; it is very thin
You are constantly losing and replacing these cells.
*Dermis
Middle layer of skin directly below the epidermis; It is much thicker and contains blood vessels, nerves, sweat glands, and other structures
*Fat Layer
Layer of skin below the dermis; This is where fat is placed when a person gains weight.
*Melanin
found in the epidermis; it gives your skin pigment and protects it from UV light
*Name some skin functions
protection, sensory response, formation of Vitamin D, regulation of body temperature, and ridding body of waste
Skin Function- PROTECTION
Your skin is the first line of protection against bacteria and viruses
Skin Function - SENSORY RESPONSE
You can sense the texture and temperature of things
Skin Function - REGULATION of BODY TEMPERATURE
If blood vessels dilate (expand), blood flow increases and thermal energy increases.

If blood vessels constrict (contract or tighten), blood flow decreases and less thermal energy is released
Skin Function - REGULATION OF BODY TEMPERATURE # 2
When it's hot, a person sweats. The sweat evaporates on the skin and cools it.
Skin Function - RIDDING BODY OF WASTES
When you sweat, you release water, salt, and other waste products
*Bruise
Caused by broken blood vessels under the skin
scab
When you cut your skin, your body begins the clotting process and forms a scab, which protects against bacteria entering the body
*Skin Grafts
They are pieces of skin that are cut from one part of the body and moved to another part of the skin that is injured or burned
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