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BIOM1052 > The Skin Lecture > Flashcards

The Skin Lecture Flashcards

1
Q

What are the 3 epidermal derivatives?

A

Hair, nails and glands

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2
Q

The skin is also called the…

A

cutaneous membrane

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3
Q

The cutaneous membrane/skin is composed of what three layers?

A

The epidermis, dermis and hypodermis

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4
Q

The thickness of skin is dependent on the thickness of the …

A

epidermis

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5
Q

T or F
Most of our skin is thick

A

F
Only the palms of our hands and the soles of our feet are considered thick

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6
Q

What parts of the skin are thick?

A

The palms of the hand and soles of the feet

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7
Q

T or F
Thin skin usually has hair, thick skin never does

A

T

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8
Q

The epidermis is a multi layered epithelium consisting primarily of …

A

keratinocytes.

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9
Q

The epidermis is classified as a s… s… epithelium

A

stratified squamous

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10
Q

What layer of the skin acts as a protective barrier?

A

The epidermis

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11
Q

Why does the epidermis provide protection against viruses?

A

Viruses need to invade a nucleus to duplicate, grow and live. Since the outer layer of the epidermis consists of dead keratinocytes, which have no nucleus or organelles, viruses cannot invade the surface.

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12
Q

The epidermis has distinct layers that represent different stages of…

A

cell maturation

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13
Q

What are the 5 layers of the epidermis?

A

Stratum granulosum
Stratum spinosum
Stratum basale
Stratum lucidum
Stratum corneum

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14
Q

What is the deepest layer of the epidermis?

A

The stratum basale

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15
Q

Which layer of the epidermis is “prickly”?

A

The stratum spinosum

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16
Q

Which layer of the epidermis contains daughter cells from basale?

A

The stratum spinosum

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17
Q

Which layer of the epidermis contains a single layer of cells?

A

The stratum basale

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18
Q

Which layer of the epidermis contains stem cells for regeneration
of the epidermis?

A

Stratum basale

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19
Q

Which layer of the epidermis is the granular layer?

A

Granular layer

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20
Q

What functions do the granules in the stratum granulosum perform?

A

Keratin formation and water resistance

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21
Q

The stratum … is a sub-division of the stratum corneum.

A

lucidum

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22
Q

Which layer of the epidermis is clear?

A

The stratum lucidum

23
Q

Which layer of the epidermis has cells that lack nucleui and organelles?

A

The stratum corneum

24
Q

Which layer of the epidermis is filled with keratin filaments?

A

The stratum corneum

25
Q

Which layer of the epidermis has a cell membrane that can become thickened?

A

The stratum corneum

26
Q

Which layer of the epidermis is coated with lipids to form a water resistant barrier?

A

The stratum corneum

27
Q

T or F
Keratinocytes mature over time

A

T

28
Q

Stem cells divide in
which layer of the epidermis?

A

The stratum basale

29
Q

What is the purpose of melanin?

A

It protects DNA from UV radiation

30
Q

T or F
Melanin degrades and must be replaced

A

T

31
Q

Melanin is packed into vesicles called …

A

melanosomes.

32
Q

Melanin is transferred into …

A

keratinocytes

33
Q

The dermis is comprised of what two layers?

A

The papillary and reticular layers

34
Q

T or F
Within the dermis, the papillary layer is closest to the hypodermis whilst the reticular layer is closest to the epidermis?

A

F
vice versa

35
Q

The papillary layer of the dermis is made up of…

A

loose connective tissue

36
Q

The reticular layer of the dermis is made up of..

A

Dense irregular connective
tissue

37
Q

T or F
Fibres in the papillary layer of the dermis have a smaller diameter than the reticular layer

A

T

38
Q

T or F
The papillary layer of the dermis contains sensory nerve endings

A

T

39
Q

T or F
The papillary layer of the dermis does not contain capillaries

A

F

40
Q

T or F
The epidermis is avascular

A

T

41
Q

The papillary layer of the dermis forms … that interlock with epidermal ridges

A

dermal papillae

42
Q

What is the purpose of the dermal papillae?

A

Strengthens attachment between epidermis and dermis

43
Q

Which layer of the dermis am I?

I am a meshwork of thick collagen and elastic fibres. I contain blood vessels, nerves, hair follicles and glands

A

The reticular layer

44
Q

What 3 functions does subcutaneous tissue have?

A

– Protection/padding
– Energy reservoir
– Insulation

45
Q

The hypodermis holds … to underlying tissue & permits … of skin

A

integument
movement

46
Q

Hair is located everywhere except…

A

on the palms, soles, lips & portions of external genitalia

47
Q

Internally, hair is surrounded by a sheath made of…

A

connective tissue

48
Q

Hair is a living/non-living structure produced in
hair follicles

A

non-living

49
Q

Hair growth starts at the…

A

hair bulb

50
Q

Hair papilla is … tissue containing ….

A

connective
blood vessels

51
Q

T or F
During the production of hair, epithelial cells divide & push downwards

A

F
upwards

52
Q

What smooth muscle is attached to hair follicles and responsible for goose bumps?

A

Arrector pili

53
Q

…. are sensory nerves that sense hair movement

A

Root hair plexus

BIOM1052 (9 decks)

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