BIO 168 Integumentary System Exam
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Integumentary system functions - ✔✔body temperature regulation, Vitamin D3
synthesis, lipid storage, sensory input
Cutaneous membrane contains... - ✔✔dermis and epidermis
epidermis functions - ✔✔protects the dermis, prevents water loss and entry of
pathogens, synthesizes D3, sensory receptors
dermis layers - ✔✔papillary and reticular
papillary layer - ✔✔nourishes and supports epidermis
reticular layer - ✔✔has sensory receptors that detect touch, pressure, pain, vibration,
and temperature. Blood vessels assist in thermoregulation
Accessory structures of the skin - ✔✔hair follicles, exocrine glands, nails
purpose of hair on skin - ✔✔protect skull and provide delicate touch sensations on
body surface
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, purpose of exocrine glands - ✔✔assist in temperature regulation and waste excretion
purpose of nails - ✔✔protect and support tips of fingers and toes
Five layers of epidermis, bottom to top - ✔✔basal layer, stratum spinosum, stratum
granulosum, stratum lucidum, stratum corneum
basal layer - ✔✔single cell layer in contact with dermis, where all keratinocytes
originate, only place you find melanocytes & merkel cells
stratum spinosum - ✔✔several layers of cells, thickest layer of "thin" skin,
stratum granulosum - ✔✔3-4 flattened cell layers, contain chemical precursor to keratin
. (keratohylin), looks grainy
stratum lucidum - ✔✔normally a very thin layer of cells, only visible in calloused skin
stratum corneum - ✔✔hundreds of layers of thick, dead, keratin-filled cells
Four epidermal cell types - ✔✔keratinocytes (90%), melanocytes (5%), Langerhans cells,
Merkel cells
stratum basale - ✔✔name the layer
stratum spinosum - ✔✔name the layer
stratum granulosum - ✔✔name the layer
stratum lucidum - ✔✔name the layer
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Questions and Answers 100% Pass
Integumentary system functions - ✔✔body temperature regulation, Vitamin D3
synthesis, lipid storage, sensory input
Cutaneous membrane contains... - ✔✔dermis and epidermis
epidermis functions - ✔✔protects the dermis, prevents water loss and entry of
pathogens, synthesizes D3, sensory receptors
dermis layers - ✔✔papillary and reticular
papillary layer - ✔✔nourishes and supports epidermis
reticular layer - ✔✔has sensory receptors that detect touch, pressure, pain, vibration,
and temperature. Blood vessels assist in thermoregulation
Accessory structures of the skin - ✔✔hair follicles, exocrine glands, nails
purpose of hair on skin - ✔✔protect skull and provide delicate touch sensations on
body surface
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, purpose of exocrine glands - ✔✔assist in temperature regulation and waste excretion
purpose of nails - ✔✔protect and support tips of fingers and toes
Five layers of epidermis, bottom to top - ✔✔basal layer, stratum spinosum, stratum
granulosum, stratum lucidum, stratum corneum
basal layer - ✔✔single cell layer in contact with dermis, where all keratinocytes
originate, only place you find melanocytes & merkel cells
stratum spinosum - ✔✔several layers of cells, thickest layer of "thin" skin,
stratum granulosum - ✔✔3-4 flattened cell layers, contain chemical precursor to keratin
. (keratohylin), looks grainy
stratum lucidum - ✔✔normally a very thin layer of cells, only visible in calloused skin
stratum corneum - ✔✔hundreds of layers of thick, dead, keratin-filled cells
Four epidermal cell types - ✔✔keratinocytes (90%), melanocytes (5%), Langerhans cells,
Merkel cells
stratum basale - ✔✔name the layer
stratum spinosum - ✔✔name the layer
stratum granulosum - ✔✔name the layer
stratum lucidum - ✔✔name the layer
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