By: Kimanh Nguyen

The skin serves as a protective barrier against infections, injuries, and ultraviolet radiation from the sun. It also helps regulates the body temperature



external image skin-cross-section1.bmp



The skin cross section includes:

  1. Skin
  2. Hair
  3. Nails
  4. Sweat glands
  5. Sebaceous glands
  6. Epidermis
  7. Dermis
  8. Hypodermis
  9. Fat
  10. Nerves
  11. Blood vessels
  12. Sweat pore
  13. Hair follicle




Functions:

v Skin

  • § The largest organ of the body
  • Ø Protects us from microbes
  • Ø Helps regulate body temperature
  • Ø Permits the sensation of touch, heat, and cold

v Hair

  • Ø Insulation
  • Ø Provides some protection
  • Ø Affects physical appearance

v Nails

  • Ø Protect sensitivity of the fingers/toes
  • Ø Affect physical appearance

v Sweat glands

  • § Located in the dermis
  • Ø Secrete sweat to regulate body temperature

v Sebaceous glands

  • Ø Secrete an oily substance called sebum
  • Ø Protects and waterproofs hair and skin

v Epidermis

  • § Outermost layer of the skin
  • Ø A waterproof barrier
  • Ø Creates our skin tone

v Dermis

  • § Beneath the epidermis
  • Ø Contains tough connective tissue, hair follicles, and sweat glands

v Hypodermis

  • § Deeper subcutaneous tissue that is made of fat and connective tissue
  • Ø Binds the skin to the tissue beneath it

v Fat

  • Ø Energy supply
  • Ø Thermal insulation

v Nerves

  • Ø Connect the brain and spinal cord with various parts of the body
  • Ø Conducts impulses from the brain

v Blood vessels

  • § Include arteries and veins
  • Ø Carry blood throughout the body
  • Ø Contain oxygen and nutrients to take to the muscles

v Sweat pore

  • Ø Releases oil and sweat on the body to regulate body temperature

v Hair follicle

  • Ø Contains the root of a hair within its small tubular cavity