Skin, Biology

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SKIN -

  1. Largest organ of body. It is covered by hairs or pelage i.e. pillifera.
  2. Study of skin is dermatology. Outermost covering of body.
  3. Skin is elastic and water proof. It is thick, dry & impermeable.
  4. Under skin, layer of adipose tissue are present directly attached to muscles by areolar tissue or tella subcutanea as lymph sinuses are absent.
  5. As age is increased, lymph sinuses are formed. So skin becomes loose.
  6. Histamine are present in skin. Maximum energy is lost from skin.
  7. Thinnest skin in eye lid. Thickest skin in sole.
  8. Skin is first of all affected by nuclear radiation.
  9. In summer, skin becomes red due to vasodilation.
  10. In winter shivering takes place i.e. by muscle contraction extra energy is released peniculus carnosus muscle is responsible for it.
  11. Preservation of skin is texidermy.
  12. Preservation of skin at low temperature is cryopreservation.
  13. Due to sweat gland, skin is pupulary known as uncoiled kidney.
  14. In skin 2 parts are clear -    

                      1. Epidermis                

                       2. Dermis


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