BIO 201 Chapter -5 Integumentary system complete verified solutions + rationales

B IO 201: Chapter #5
Integu m entar y system com plete
ver ifi ed solu tions + r ationales
(PASS GUARANTEED)
Skin - answer Largest body organ, variable thickness (1.5-4mm) 7% body
weight (9-11 pounds)


Epidermis - answer Superficial layer, stratified squamous epitheilium -
30-50 layers thick, superficial cells are dead, contains keratin.


Dermis - answer Inner layer of the skin, thicker than epidermis,
increased collagen and elastic fibers, increased vascularity, contains
nerves, glands, hair follicles.


Papillary layer - answer Dermal layer. Connects to epidermis - has
dermal papillae, capillary loops, Meissner corpuscles. Fingerprints
formed from here.


Reticular layer - answer Deeper, thicker, flexible - extensible
Tension lines:***
Flexure lines: ***

, Linea albicans: Stretch marks
Tearing of the dermis due to overstretching - mark is increased collagen
repaired dermis


Hypodermis - answer Subcutaneous tissue, binds dermis to underlying
tissue, primarily connective tissue, adipose, vasculature, varies with
body region, sex, age, nutritional state


Stratum corneum - answer Epidermal layer, flat, keratinized, cornified.


Stratum lucidum - answer Epidermal layer. Extra layer found in palms,
soles of feet only


Stratum granulosum - answer Epidermal layer. Granular cells, produces
keratin. Contains keratinocytes which produce keratin


Stratum spinosum - answer Epidermal layer. Limited mitosis. Contains
Langerhans cells - activate immune response.


Stratum basale - answer Deepest epidermal layer. Highly mitotic.
Contains
Melanocytes - produces melanin
Merkel cells - sensory nerve ending