Summary: Integumentary System
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1 Integumentary System
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What are the functions of the Integumentary System?
Protection, thermoregulation, sensory reception, and synthesis of vitamin D. -
1.1 Epidermis
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What are the five layers of the epidermis (from deep to superficial)?
Stratum basale, stratum spinosum, stratum granulosum, stratum lucidum (only in thick skin), stratum corneum. -
What happens in the stratum basale?
Continuous cell division occurs, which produces all the other layers -
What characterizes the stratum spinosum?
They havekeratinocytes on them, which makes thecells appear to have littlespines . -
What happens in the stratum coroneum?
Dead keratinocytes that are continuallyshedding and that arereplaced bycells fromdeeper strata -
What is special about the stratum lucidum?
Found only in thick skin -
What happens in the stratum granulosum?
Keratinocytes die, nuclei and organelles disintegrate. -
1.2 Dermis
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What type of tissue is the dermis made out of?
The dermis consists primarily of dense connective tissue. -
What are the two layers of the dermis?
Papillary layer and reticular layer. -
What is found in the papillary layer?
Loose connective tissue, elastin & collagen, dermal papillae (form fingerprints).
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