B IO201: Integu m entar y
w or ksheet com plete ver ifi ed
solu tions + r ationales (PASS
GUARANTEED)
What is the largest organ in the body? - answer skin, 15% of body
weight
What are the regions of the skin? - answer epidermis, dermis,
hypodermis (subcutaneous)
What are the functions of skin? - answer resistance to trauma and
infection, barrier to ultraviolet light, vitamin D synthesis, sensory
receptors, thermoreceptors through sweating, nonverbal
communication
What are the epidermal layers? (deep to superficial) - answer stratum
corneum, stratum lucidum, stratum granulosum, stratum spinosum,
stratum basale
What are the characteristics of the stratum corneum? - answer up to 30
layers of dead, scaly keratinized cells, surface cells flake off
, What are the characteristics of the stratum lucidum? - answer
translucent zone, only seen in thick skin, cells have no nucleus or
organelles
What are the characteristics of the stratum granulosum? - answer 3-5
layers of flat keratinocytes, contain keratinohyalin granules, produces
lipid-filled by exocytosis to waterproof the skin
What are the characteristics of the stratum spinosum? - answer several
layers of keratinocytes, contains dendritic cells
What are the characteristics of the stratum basale? - answer single layer
cells on basement membrane, keratinocytes, melanocytes, and merkel
cells (touch receptors) in this layer
What are stem cells? - answer undifferentiated cells in deepest layers
What are keratinocytes? - answer most of the skin cells
What are melanocytes? - answer synthesize pigment that shield UV
What are tactile (merkel) discs? - answer receptor cells associated with
nerve fibers
w or ksheet com plete ver ifi ed
solu tions + r ationales (PASS
GUARANTEED)
What is the largest organ in the body? - answer skin, 15% of body
weight
What are the regions of the skin? - answer epidermis, dermis,
hypodermis (subcutaneous)
What are the functions of skin? - answer resistance to trauma and
infection, barrier to ultraviolet light, vitamin D synthesis, sensory
receptors, thermoreceptors through sweating, nonverbal
communication
What are the epidermal layers? (deep to superficial) - answer stratum
corneum, stratum lucidum, stratum granulosum, stratum spinosum,
stratum basale
What are the characteristics of the stratum corneum? - answer up to 30
layers of dead, scaly keratinized cells, surface cells flake off
, What are the characteristics of the stratum lucidum? - answer
translucent zone, only seen in thick skin, cells have no nucleus or
organelles
What are the characteristics of the stratum granulosum? - answer 3-5
layers of flat keratinocytes, contain keratinohyalin granules, produces
lipid-filled by exocytosis to waterproof the skin
What are the characteristics of the stratum spinosum? - answer several
layers of keratinocytes, contains dendritic cells
What are the characteristics of the stratum basale? - answer single layer
cells on basement membrane, keratinocytes, melanocytes, and merkel
cells (touch receptors) in this layer
What are stem cells? - answer undifferentiated cells in deepest layers
What are keratinocytes? - answer most of the skin cells
What are melanocytes? - answer synthesize pigment that shield UV
What are tactile (merkel) discs? - answer receptor cells associated with
nerve fibers
