BIO 168 Integumentary System Questions and Answers With Verified Solutions
2025
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
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
stratum corneum - ✔✔name the layer
Are sebaceous glands in thick or thin skin? - ✔✔Thin
How do fingerprints develop? - ✔✔Pull of elastic fibers in the dermis. Prenatally determined.
How do lines in your palms and knuckles appear? - ✔✔Deep and shallow flexion creases
2025
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
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
stratum corneum - ✔✔name the layer
Are sebaceous glands in thick or thin skin? - ✔✔Thin
How do fingerprints develop? - ✔✔Pull of elastic fibers in the dermis. Prenatally determined.
How do lines in your palms and knuckles appear? - ✔✔Deep and shallow flexion creases
