Accessory Organs Nails
FUNCTION: as protective coverings
DESCRIPTION: made up of nail plate, cells divide and keratinize
LOCATION: ends of fingers, nail beds

Hair Follicles
FUNCTION: structure of hair, as sense organs, regulation of temperature through arrector pili muscle
DESCRIPTION: color determined by genes, hair develops from this group of cells
LOCATION: present everywhere but palms, soles and nipples

Sebaceous Glands
FUNCTION: keeps hair and skin soft, pliable and waterproof
DESCRIPTION: secretes mixture of fatty wastes and sebum
LOCATION: around hair follicles

Sweat Glands
FUNCTION: secretes waste
DESCRIPTION: sweat made of mostly water and some waste, mostly eccrine glands with some apocrine glands that become active at puberty, mammary glands are modified sweat glands that secrete milk
LOCATION: all over, most numerous on forehead, neck and back

Melanin and Skin Color Albinism is the inability to produce melanin
All people have the same average number of melanocytes
Skin color differentiates based on the AMOUNT of melanin the melanocytes PRODUCE
Genetically determined but can be affected by UV (sun and artificial), amount of blood (red = lots of oxygen, blue = not very much oxygen), and diet (yellow = too much B-carotene)

Healing Wounds Uses inflammatory response to injury and stress
Can become red, painful, swollen and warm
The blood vessels dilate to become more permeable to blood
Provides tissue with more nutrients and oxygen to aid in the healing process
Shallow cuts will be filled with rapidly diving epithelium
Deep cuts will break blood vessels to create clots and scab to form new collagenous fibers and bind wound

	Criado por Courtney Merkel quase 9 anos atrás

Tissues and skin