Excretion- chp31
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14 Terms
Excretion
the removal of waste from the body
Ectotherms
gain or lose heat to thier external environment
Endotherms
generate their own heat from metobolic reactions
the 3 layers of the skin
epidermis, dermis, adipose tissue
the 3 layers of the epidermus
cornified, granular and malphighian
where does mitosis take place?
the malpighian layer
what happons to the new cells that are pushed through the granular layer?
they produce keratin
melanin is produced in the ———— layer
malpighian
the function of melanin…
to protect against uv rays
the dermis is made up of…
collagen
what structures does it contain?
hair follicles, sebaceous glands,sweat ducts, sense/nerve receptors, capillaries
4 ways the skin protects the body
epidermis- prevents water loss and pathogen entry, acts as a barrier
dermis- protects internal organs
Melanin- protects from UV rays
sebum- prevents skin from drying up and cracking
where is fat stored in the skin?
adipose tissue