Integumentary System (Functions) Flashcards Preview

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Flashcards in Integumentary System (Functions) Deck (15)
1

hermoregulation

homeostatic regulation of body temperature
the skin liberates sweat at the surface and adjusts flow of blood in the dermis

2

blood reservoir

ther dermis houses network of blood vessels that carry 8 to 10 % of the totatl blood flow in a resting adult

3

protection

tightly intelocked cells (keratinocytes) resis invasion by microbes
oily sebrum keeps skin and hair from drying out and kills surface bacteria

4

keratin

protects the underlying tissue from microbes, abrasions, heat, and chemicals

5

melanin pigment

helps sheild against damaging effects of UV light

6

immunological function

aletering immune system to presence of microbial invadersand consuming any that bypass the alerting cells

7

cutaneous sensations

sensations that arise in the skin: tactile, pain, thermal

8

tactile sensations

touch, pressure, vibration, and tickling

9

excretion

elimination of substances from the body
about 400 mL of water evaporates from the corneum daily

10

sweat

removes heat, salts, carbon dioxide, and byproducts of protein breakdown (ammonia and urea)

11

absorption

the passage of materials from the external environment into body cells

12

lipid soluable substances

penetrate the skin including vitamins A,D, E and K, certain drugs, oxygen, and carbon dioxide

13

synthesis of vitamin D

requeires activation of a precursor molecule in the skin by UV rays in sunlight
enzymes in the liver and kidneys modify the activated molecule

14

calcitrol

most active form of vitamin D
hormons that aids in the absorption of calcium in foods from the GI tract into the blood

15

10 to 15 minutes

UV exposure at least twice per week is required fro vitamin D synthesis