support and protection Flashcards
invertebrate integument
most have complex tissue coverings and secrete a noncellular cuticle over epidermis
arthropod integument
exoskeleton provides protection and skeletal support
describe molting
-epidermal cells divide mitotically
-enzymes digest procuticle
-space grows
what is the epidermis made of
several layers of epithelium
keratinization
keratin accumulates in cells , the older it is the more it has and they later die and are shed off
what is the function of the dermis
supports, cushions, and nourishes the epidermis
contains blood vessels, collagenous fibers, nerves, pigment cells, and connective tissue cells
dermis
chromatophores
pigment cell
bright iridescent cells underneath chromatophores
irridocytes
what occurs to the muscles surrounding the chromatophores when there is no color?
the muscles relax and chromatophore shrinks
what occurs to the muscles surrounding the chromatophores when color is shown?
muscles contract and the chromatophore expands
cephalopods use ___ to change their skin texture
papillae
papillae is a muscular hydratostat, what is it made of?
made of tissue that remain constant in volume- contracts some muscles to create extensions others
flexible skeleton supported by fluid pressure
hydrostatic skeleton
hydrostatic skeletons are fluid filled ___ surrounded by muscles, used to change shape and move around
coelom
