7.1 skin system Flashcards

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1
Q

Outline the functions of the skin (regulation of body temp)

A
  • evaporative cooling
  • increase blood flow to the skin
  • increase sweat
    evaporation of sweat cools the skin which decreases body temp
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2
Q

Protection & Immunity

A
  • protects underlying tissues against impact, abrasion, fluid loss, and harmful chemicals
  • physical barrier to pathogens
  • surface of the skin has an acidic pH to prevent bacteria from reproducing
  • special cells produce a pigment called melanin in the basal layer of the epidermis to prevent UV damage
  • sensory nerve endings in the skin can detect pain and trigger reflex actions
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3
Q

Sensation

A
  • detection of touch, pain, and temperature
  • info passed to nervous system
  • different receptors are found in different levels of the skin, firing impulsions to communicate with the rest of the nervous system
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4
Q

Secretion

A
  • salts, water, and organic wastes by glands
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5
Q

Vitamin D synthesis

A
  • when exposed to sunlight, epidermal cells convert a chemical in the sebum into vitamin D
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6
Q

wut is the importance of vitamin D?

A

important in absorption of calcium which promotes bone growth and muscle contraction

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7
Q

know the diagram of the skin

A

IT WONT LET ME PUT A PIC IN

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8
Q

Epidermis

A

-top layer
-no direct blood supply or nerve ending
-provides protection
-skin color

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9
Q

Dermis

A
  • middle layer
  • contains nerve endings, hair follicles, sweat glands, capillaries-blood vessels
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10
Q

Fat cells (subcutaneous tissue)

A
  • below the dermis
  • provides protection and insulation
  • larger blood vessels
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11
Q

Sebaceous gland

A
  • secretes SEBUM, oily matter that keeps skin from getting dry and water proofs the hair in mammals
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12
Q

Sweat gland

A
  • thermoregulations
  • secretes sweat
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13
Q

Hair follicle

A
  • hair is embedded in the skin
  • base contains living cells that divide
  • hair is attached to muscle (arrector pili muscle)
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14
Q

increase body temp

A
  • vasodilation
  • body hairs lie flat
  • sweat
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15
Q

decrease body temp

A
  • vasoconstriction
  • body hairs stand on end
  • shiver
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16
Q

Sebum

A

oily matter that keeps the skin from getting dry and waterproofs the hair in mammals