systemniom.blogg.se - How does a sponge move water through it

ĬO2/O2 enter/exit through simple diffusion (movement of a substance across the cell membrane) Figure 8: Diffusion – the movement from high concentration to low concentration over a membrane D. Sponges function more like a colony of unicellular organisms. No respiratory or circulatory system! Each cell is responsible for it’s own food/waste etc.

The host dies from this or becomes more susceptible to predation.

The sponges bore into corals or shelled animals.

Figure 6: Choanocytes Parasitic Sponges – Boring Sponges!

Food enters the cell through phagocytosis ( Same as many unicellular organisms such as amoebas)Ĭhoanocytes ( Collar Cells ) – Cells surrounding the “collar” that strains food from the water.

The spongocoel and canals are lined with choanocytes which have flagella (whip-like tails) which pull food inward.

They pull water into the spongocoel (middle cavity of a sponge) through pores.

Spicules hold pores open and keep sponge shape.

Spicules are made of calcium carbonate (solid), silica, or spongin (a type of collagen – flexible and soft).

Sponges are supported by a “skeleton” of spicules. Water is pulled into the spongocoel through pores and leaves out the osculum (top of spongeģ.First Multicellular animal – basic body plan is just four types of cells arranged around a series of pores/canals. All other animal groups evolved from sponge-like ancestorsįigure 1: Sponge Diversity A.Appeared ~700 Million years ago ( Oldest multicellular animals on Earth).Por i fera -> “ Pore” “ Bearing ” Latin Name means to bear pores.