porifera Flashcards
what is the habitat of sponges
aquatic / marine
what level of organization
cellular level: no tissue levels
- multi cellular
what is in the outer layerof the body wall
flattened epidermal cells
- some have contractible fibers
what is in the middle layer of the body wall
semifluid matrix with wandering ameboid cells
what is in the inner layer of the body wall
flagellated cells / collar cells
what happens with the beating of the flagella
makes warm water currents that flow through the pores, into the central cavity and out through the osculum (upper opening of the body)
what is a filter feeder (sponges are filter feeders)
filters its food from the water by means of a straining device
- pores of the walls and microvilli in the collar of collar cells
how is food captured
collar cells make a food vacuole for digestion or is passed to amebocytes for digestion
what do ameboid cells do
- circulate/transport nutrients from cell to cell
- produces sex cells / gametes and spicules
how do they produce asexually
fragmentation / budding
- small protuberance appears and gets bigger
how do they produce sexually
eggs and sperm released into central cavity and zygote develops into a flagellated larva that may swim to a new location
what is their internal skeleton made of
spicules
- calcium carbonate
- silica
- fibres of spongin
individual cells are responsible for _____ since sponges have no body systems
digestion, excretion, etc
