integumentary system Flashcards
integumentary system…
skin (largest organ); hair; nails
the skin
composed of 3 layers:
- epidermis
- dermis
- hypodermis
epidermis
outermost layer
waterproof (keratin produces waxy protein)
no blood vessels
deepest portion stratum Basale- single layer of cells that continually undergo division
dermis
under epidermis
dense connective tissue, sensory receptors, sebaceous glands, sweat glands, home to blood vessels, glands and hair follicles
contains elastin and collagen fibers
hypodermis (subcutaneous layer)
connective tissue, which binds skin to underlying muscles. fat deposits help to cushion and insulate the body
receptors
sensory cells located in dermis of skin
thermoregulation
process that allows your body to maintain its core internal temperature
exocrine glands
secrete substances into ducts. ducts to the surface of the skin
hypothalamus
control center, located in brain
effectors include:
sweat glands, blood vessels, and muscles (shivering)
vasodilation is
blood vessels near the surface of the skin also release heat into the environment to lower the body temperature
sebum is..
oily mixture of lipids and proteins. inhibits water loss from skin and protects against bacterial and fungal infections
sebaceous glands are..and what do they secrete
holocrine glands which secrete sebum
sweat glands are…
either eccrine glands or apocrine glands
eccrine glands are…
- not connected to hair follicles
- activated by elevated body temperature
- located through out body and can be found on forehead, neck, and back
- secrete sweat
