BIO 446L Exam 5 Pt 4 Skin Practice Questions and Correct Answers
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Course
BIO 446
Institution
BIO 446
Functions of skin -barrier -maintain bodily fluids -sensory -synthesizes vitamin D -modulates body temperature -sexual signaling
Skin barrier against -microorganisms -harmful substances -light
Layers of the skin -epidermis -dermis
Epidermis -thin -devoid of blood vessels -four layers-play differ...
BIO 446L Exam 5 Pt 4 Skin Practice
Questions and Correct Answers
Functions of skin ✅-barrier
-maintain bodily fluids
-sensory
-synthesizes vitamin D
-modulates body temperature
-sexual signaling
Skin barrier against ✅-microorganisms
-harmful substances
-light
Layers of the skin ✅-epidermis
-dermis
Epidermis ✅-thin
-devoid of blood vessels
-four layers-play different roles at different anatomic sites
-cells:
1. Keratinocytes
2. Melanocytes
3. Dendritic cells
4. Tactile cells
Keratinocytes ✅-in epidermis
-produce stratum corneum
-produce a second line of biochemical defense:
1. Cytokines
2. Prostaglandins
3. Antioxidants
4. Xenobiotic metabolizing enzyme systems (eliminate toxic compounds)
Melanocytes ✅-in epidermis and hair follicles
-synthesize and transfer melanin (within melanosomes) to keratinocytes
-melanin (absortbs UVL, protects DNA in the basal cells from damage)
Dendritic cells ✅-in epidermis
-immune surveillance
-present antigen to T-lymphocytes of the afferent immune system
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