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INTEGUMENTARY SYSTEM

INTEGUMENTARY SYSTEM. THE FUNCTIONS . SEVEN FUNCTIONS OF THE SKIN. 1. Protection 2. Regulation of body temperature 3. Manufactures vitamin D 4. Sensory perception 5. Storage 6. Sun screen 7. Absorption. 1. PROTECTION.

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INTEGUMENTARY SYSTEM

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  1. INTEGUMENTARY SYSTEM THE FUNCTIONS

  2. SEVEN FUNCTIONS OF THE SKIN • 1. Protection • 2. Regulation of body temperature • 3. Manufactures vitamin D • 4. Sensory perception • 5. Storage • 6. Sun screen • 7. Absorption

  3. 1. PROTECTION • Intact skin is the best protection • Skin generally too dry for microbial growth • Most skin bacteria associated with hair follicles or sweat glands • Best way to prevent the spread of disease is handwashing

  4. 2. BODY TEMPERATURE • Regulates temperature by controlling the amount of heat loss • Evaporation of water from the skin, in the form of perspiration, helps rid the body of excess heat

  5. 3. VITAMIN D • Ultraviolet light from the sun onto the skin is necessary for the first stages of vitamin D formation

  6. 4. SENSORY PERCEPTION • Skin is the site of many nerve endings • A square inch of skin contains about 72 feet of nerves and hundreds of receptors • Look at figure 5-1 on page 72

  7. 5. STORAGE • Skin has tissues for the temporary storage of fat, glucose, water, and salts • Most of these substances are later absorbed by the blood and transported to other parts of the body

  8. 6. SUN SCREEN • Skin is designed to screen out harmful UV radiation contained in sunlight

  9. 7. ABSORPTION • Skin has special properties to absorb certain drugs and other chemical substances • Allows us to apply drugs locally (such as applying hydrocortisone for rashes) or we can apply medications that can be absorbed through the skin and have a general effect on the body (such as Nitro-Bid paste or Nitro patch) • Question: what does Nitro-Bid or a Nitro patch do?

  10. GLANDS • Sudoriferous/Sweat Glands • Perspiration is 99% water with only small quantities of salt and organic materials (waste products) • Distributed over the entire skin surface • Large numbers under the arms, and on the palms of the hands, soles of the feet, and forehead • Perspiration is excreted through the pores • Activated by heat, pain, fever, and nervousness and other factors • Underarm odor: caused by bacteria mixed with sweat • Lose an average of 500mL of water a day through the skin (but varies according to exercise and environmental temperature)

  11. Sebaceous/Oil • Sebum: thick, oily substance that protects the skin; lubricates the skin, keeping it soft and pliable • Sebum is secreted by the sebaceous glands • Sebum contains amino acids, lactic acids, lipids, salt, and urea

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