Question

skin

• the ______ organ of the body
• has 2 main layers:

□ ____ - the outer, thinner layer of the skin that is composed of __ and ____ cells

• cells in this layer make substances called ______ which make the skin
• helps the body maintain a proper balance of ______ and
• ____, a pigment that gives the skin, hair, and iris of the eyes their __ and protects body from harmful ____ radiation is also produced here

o ____ - the thicker layer of the skin beneath the epidermis that is made up of connective tissue (gives skin its elasticity) and contains blood vessels (supply cells with oxygenated __ and __ and help remove ____ from body cells) and nerves

• ____ glands - produce an oily secretion called ____ → helps keep skin and hair from drying out
• ____ layer - a layer of ____ and connective tissue below the dermis that attaches the top two layers to muscle and bone

Explanation:

Skin is the largest organ of the body. The outer - thinner layer is the epidermis composed of keratinocytes and melanocytes. Keratinocytes make keratin for waterproofing and melanocytes make melanin for color and UV protection. The thicker layer beneath is the dermis with connective tissue, blood vessels (supply oxygenated blood and nutrients, remove waste), and sebaceous glands producing sebum. Beneath the dermis is the hypodermis layer of fat and connective tissue attaching skin to muscle and bone.

Answer:

• the largest
• epidermis; keratinocytes; melanocytes; keratin; waterproof; water; electrolytes; melanin; color; ultraviolet
• dermis; blood; nutrients; waste; sebaceous; sebum
• hypodermis; fat