Integumentary System

Ivana Damnjanović

Integumentary System

Protection & supportSensoryExcretionRespiratory (amphibians)Thermoregulation

Dissipate 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

hooves

clutches

nails

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

Dermis

Sensory cellsSkin glands

Dermis

Chromatophores Homeotherms have melanophores & pigment is

INJECTED into epidermis Poikilotherms – the pigment stays in the dermis

Hypodermis- adipose cells