largest organ protects and insulates made of keratin (waterproofing)
TRANSCRIPT
Skin Functions1) Protects—holds fluids
in, keeps disease causing organisms out
2) Melanin—pigment produced to protect from UV rays
Skin Functions
3) Makes vitamin D from sunlight and a lipid called cholesterol
4) Nerve endings—sense heat, cold, pressure
Skin...working with other systems
• The skin works with:• Immune system—keeps pathogens out•Excretory system—releases waste through sweating•Nervous system—largest sensory organ
Parts of the Skin• Epidermis-top
layer, dead cells with tiny openings called pores• Sebum-an oil,
produced to keep skin soft and flexible
• Dermis-thick layer, made up of collagen and produces melanin•Contains nerve endings, blood vessels, and hair follicles
Parts of the Skin
Hair and Nails• Hair—made up of dead cells similar
to the top layer of epidermis• Nails—made up of solid plate of
epidermal cells
Pimples/Acne• Caused by a buildup of sebum under
the skin and bacterial infections• Squeezing pimples can cause the
infection to spread/worsen