Last skin powerpoint. Skin glands: Two kinds 1.Sebaceous (oil) 2.Sweat.

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Presentation transcript:

Last skin powerpoint

Skin glands: Two kinds 1.Sebaceous (oil) 2.Sweat

Sebaceous (oil) Glands Are openings around the hair follicle that produce oil Keeps the hair from getting brittle and breaking

Dead skin cells left behind may become 'glued' together by the oil. This causes a blockage in the pore. Pimple

Sweat Glands Stimulated by nerves to release sweat to cool the body The sweat evaporates removing the heat You have approx 2-3 million sweat glands

Skin is a sense receptor Nerves recognize: –Pressure (touch) –Pain –Heat –cold

Body Temperature must be constant Skin has hot and cold receptors Body temp. is controlled by brain

Body too hot: Blood vessel in dermis expand Muscles relax Sweating increases

Body too cold: Blood vessel close up Muscles contract (shiver) Goose bumps (muscles around hair contracts to trap air which acts like insulation)

Bruise occurs when a force causes blood vessels to break. Blood leaks into areas under the skin, resulting in pain, swelling, and skin discoloration.