A&P - Chapter 10 (Part 1) Flashcards

1
Q

What type of membrane does the skin have?

A

Cutaneous

- integument

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2
Q

What are the 2 primary layers of the skin?

A
  1. Epidermis

2. Dermis

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3
Q

What is the supporting layer of the skin?

A

Hypodermis

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4
Q

How much does thin skin cover?

A

Most of the body

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5
Q

How thick is thin skin?

A

1-3mm

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6
Q

Where do you find thick skin? (2)

A
  1. Soles

2. Palms

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7
Q

How thick is thick skin?

A

4-5mm

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8
Q

What kind of texture does thin skin have? (2)

A
  1. Smooth

2. Has hair

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9
Q

What kind of texture does thick skin have? (2)

A
  1. Ridged

2. No hair

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10
Q

Epidermis

A

Is the outermost and thinnest primary layer of skin

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11
Q

What are the types of cells that compose the epidermis? (4)

A
  1. Keratinocytes
  2. Melanocytes
  3. Epidermal dendrite cells
  4. Tactile epithelial cells
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12
Q

What percent of epidermis cells are keratinocytes?

A

90%

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13
Q

Where are keratinocytes located?

A

Outer skin

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14
Q

What does keratinocytes do?

A

They are water proof

- water-proofing

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15
Q

What percent of epidermis cells are melanocytes?

A

5%

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16
Q

What are 2 functions of melanocytes?

A
  1. Pigment producing

2. Filters UV light

17
Q

What do epidermal dendritic cells play a part of?

A

The immune response

18
Q

What do tactile epithelial cells play a part of?

A

Sensory response

- light touch

19
Q

What epidermal cells are rich with RNA?

A

Keratinocytes

20
Q

Is the most superficial layer of skin alive or dead?

A

Dead

21
Q

Why is the outer most layer dead?

A

You want your first layer of defence to not really matter

22
Q

What are the epidermis cell layers, from outermost to innermost? (5)

A
  1. Stratum corneum
    - horny layer
  2. Stratum lucidum
    - clear layer
  3. Stratum granulosum
    - granular layer
  4. Stratum spinosum
    - spiny layer
  5. Stratum basale/germinativum
    - base layer
23
Q

What does the stratum corneum layer consist of?

A

Dead cells filled with keratin

24
Q

What is the stratum lucidum layer cells filled with?

A

Keratin precursor

25
Q

What do stratum granulosum cells contain?

A

High levels of lysosomal enzymes

26
Q

What are stratum spinosum cells rich with?

A

RNA

27
Q

What do stratum basale cells undergo?

A

Mitosis

28
Q

How many days does it take for the skin cells to reach the surface?

A

35

29
Q

Dermoepidermal junction

A

Is the specialized area between the epidermis and the dermis

30
Q

What does the dermoepidermal junction act like?

A

Glue

- holds the 2 layers (epidermis and dermis) together

31
Q

What does the breakdown of the dermoepidermal junction cause?

A

Blisters