12.1 Epidermis & Dermis Flashcards
1
Q
Integumentary system two layers
A
Epidermis and dermis
2
Q
Skin is what percent of your body weight
A
7% - largest organ
3
Q
Skin functions
A
- protects from external environment
- regulated body temperature
- detects cutaneous sensations
- synthesis vitamin D
4
Q
Vitamin D deficiency can lead to
A
Calcium deficiency (osteoporosis)
5
Q
Thick skin found in
A
Palmar and plantar (no hair)
6
Q
80% of skin
A
Dermis (CT dense irregular)
7
Q
20% of skin
A
Epidermis - epithelial (stratified squamous)
8
Q
Hypodermis
A
Subcutaneous fat/fascia
9
Q
Epidermis is avascular
A
True
10
Q
Epidermis is primarily
A
Primarily:
Keratinocytes (produce keratin)
- protection and waterproofing
11
Q
Thick skin has more
A
Stratum corneum (dead cells)
12
Q
Skin pigments
A
Hemoglobin & Melanin
13
Q
Hemoglobin pigment
A
- capillaries near epidermis for thermoregulation
- allows crimson color of blood to show through
14
Q
Melanin pigment
A
- melanocyte activity (not number) determines function (8% of epidermis)
- freckles are uneven distribution of melanin
- mole is cluster of melanocytes
- UV light damages DNA
15
Q
Cancer is
A
Unrestricted growth
