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Integumentary System > Epidermis > Flashcards

Epidermis Flashcards

1
Q

Epidermis is made of (epithelium)

A

Stratified squamous Epithelium

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2
Q

Nutrients and oxygen

A

Diffuse from capillaries in the dermis

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3
Q

Keratinocytes are the body’s

A

Most abundant epithelial cells

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4
Q

Keratinocytes contain

A

Large amounts of keratin

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5
Q

Thin skin

A

Covers most of the body
Has 4 layers of keratinocytes

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6
Q

Thick skin

A

Covers the palms of the hands and the soles of the feet
Has 5 layers of keratinocytes

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7
Q

Stratum basal (germinativum)

A

Attached to basement membrane by Hemidesmosomes

Forms a strong bond between epidermis and dermis
Contains epidermal ridges
Has many basal cells

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8
Q

Epidermal ridges lie next to

A

Dermal papillae

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9
Q

Basal cells , replace

A

Stem cells that replace superficial keratinocytes

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10
Q

Structures of stratum basal

A

Tactile discs
Melanocytes

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11
Q

Tactile discs

A

Tactile (merkel) cells with sensory nerve endings
Found in hairless skin
Respond to touch

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12
Q

Melanocytes

A

Contain the pigment melanin

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13
Q

Stratum spinosum has (number of layers)

A

8-10 layers of keratinocytes bound by desmosomes

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14
Q

Stratum spinosom cells (appear)

A

Appear spiny

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15
Q

Stratum spinosum is produced by

A

Division of cells in stratum basale some continue dividing

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16
Q

Stratum spinosum contains

A

Dendritic(langerhans)cells which are active in immune response

17
Q

Stratum granulosum has (layers)

A

3-5 layers of keratinocytes

18
Q

Stratum granulosum is produced from

A

Cells of stratum spindsum

19
Q

Most cells stop dividing and produce

A

Keratin
Keratonyalin

20
Q

Keratohyalin (forms) (promotes)

A

Forms dense granules
Promotes cellular dehydration and cross-linking of keratin fibers

21
Q

After production of proteins cells

A

Die

22
Q

Stratum lucidum is only found

A

In thick skin

23
Q

Stratum corneum

A

Exposed surface of skin
Water resistant

24
Q

Keratinization

A

The formation of protective layers of cells filled with keratin

25
Q

Water is lost in skin in two way

A

Insensible perspiration
Sensible perspiration

26
Q

Insensible perspiration

A

Water diffuses and evaporates from top layer of skin
Rate increases if stratum corneum is damaged

27
Q

Sensible perspiration

A

Water excreted by sweat glands

28
Q

The layer of the epidermis that contains abundant desmosomesis the stratum

A

Spinosum

29
Q

Cells that are in the epidermis that are part of the immune system

A

Dendritic cells

30
Q

Melanin is produced by melanocytes within the stratum

A

Basale

31
Q

Vitamin D3 is important for proper

A

Bone development

Integumentary System (5 decks)

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