Integumentary SystemIvana Damnjanovi

Integumentary SystemProtection & supportSensoryExcretionRespiratory (amphibians)ThermoregulationDissipate heat (blood vessels, sweat)Conserve heat (blood vessels, hair, feathers)

LocomotionBody shapeProtective coloringVitamin D synthesis

Epidermis, dermis and hypodermis

Epidermis-surface layer

Dead cellsNonvascular

Feathers Scales

Horns

hoovesclutchesnails

Epidermis-inner layer

Mucus cells (amphibians, fish)Proteinaceous cells/granular cells

(Poisons, photophores, pheromones)

Keratinocytes Produce keratin protein a fibrous protein that helps protect the epidermisMelanocytes - produces the brown pigment melanin, a pigment in the skin, eyes, and hair

Dermis

DermisCollagen for strengthElastic fibersSmooth muscleBlood and lymph vesselsHair follicles

DermisSensory cellsSkin glands

DermisChromatophoresHomeotherms have melanophores & pigment is INJECTED into epidermisPoikilotherms the pigment stays in the dermis

Hypodermis- adipose cells