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So What Does The Skin Do?

So What Does The Skin Do?. 32.7 Vertebrate Skin— Example of an Organ System. Skin is the body’s interface with the environment Sensory receptors, barrier against pathogens, internal temperature control, water conservation

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So What Does The Skin Do?

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  1. So What Does The Skin Do?

  2. 32.7 Vertebrate Skin—Example of an Organ System • Skin is the body’s interface with the environment • Sensory receptors, barrier against pathogens, internal temperature control, water conservation • Vertebrate skin is made up of all four tissue types arranged in two layers: • Outer epidermis contain keratinocytes • Deeper dermis contains nerves, blood and lymph vessels, hair follicles and glands

  3. Epidermis – epithelial tissue a. stratum germinativum – wavy ridges extend from dermis, stem cells regenerate skin takes ~ 14d - as cells move outward they gain keratin b. stratum corneum – dead outer layer (~ 14 d) Skin Color – melanin & blood supply.

  4. outer flattened epidermal cells cells being flattened dividing cells dermis Fig. 32-13b, p. 548

  5. Dermis – contains accessory structures a. Hair papilla at base of follicle adds keratin - contains blood vessels and nerves (sensation) - arrectorpili makes hair stand on end b. Sebaceous glands – sebum lubricates hair & inhibits bacteria. Activated at puberty. - May clog & form acne c. Sweat glands – secretes water, salt & substances that produce body odor

  6. hair epidermis dermis hypodermis sensory neuron oil gland sweat gland hair follicle blood vessels smooth muscle Fig. 32-13a, p. 548

  7. hair’s cuticle one hair cell keratin polypeptide chain keratin macrofibril Fig. 32-13c, p. 548

  8. Sunlight and Human Skin • Melanocytes in skin make a brown pigment (melanin) which affects skin color and tanning • Melanin protects against UV radiation • A little UV promotes vitamin D production • A lot of UV damages DNA and promotes cancer

  9. Nails – can be used as an indicator for circulation. - WHAT IS CLUBBING?

  10. 32.8 Farming Skin • Commercially grown skin substitutes are already in use for treatment of chronic wounds • Skin may be a source of stem cells that could be used to grow other organs

  11. http://apbrwww5.apsu.edu/thompsonj/Anatomy%20&%20Physiology/2010/2010%20Exam%20Reviews/Exam%202%20Review/Ch%205%20Burns.htmhttp://apbrwww5.apsu.edu/thompsonj/Anatomy%20&%20Physiology/2010/2010%20Exam%20Reviews/Exam%202%20Review/Ch%205%20Burns.htm

  12. 32.7-32.8 Key ConceptsA Closer Look at Skin • Skin is an example of an organ system • It includes epithelial layers, connective tissue, adipose tissue, glands, blood vessels, and sensory receptors • It helps protect the body, conserve water, control temperature, excrete wastes, and detect external stimuli

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