Animal Diversity: Invertebrates - Phylum Porifera
Order by
10 terms
Terms | Definitions |
|---|---|
 • Number of tissue | no true tissue |
| • Type of body cavity | no body cavity |
| what do they lack? | They lack tissues, organs, and organ system. |
| what kind of digestion? | intracellular |
| where does gas exchange occur? | Gas exchange and excretion occur via diffusion across individual cell membranes. |
| What is the sponge body comprised of? | The sponge body is comprised of a couple different cell types that form the outside and inside layers of the body wall. |
| What are choanocytes? | Specialized flagellated cells, choanocytes, move water through and filter food particles from the water |
| How do the sponges have structure and strength? | Extracellular protein fibers give structure and strength to the sponge body and spicules, spines made of silica or calcium carbonate, offer protection from predation. |
| What kind of feeding? | Sponges are sessile (sedentary), filter feeding animals |
| How does water enter the body? | In simple sponges, water enter the body through pores in the walls called ostia and passes into the spongocoel, a central space lined with choanocytes where food particles are trapped and digested intracellulary. Nutrients are passed to neighboring cells. Water leaves through a hole at the top of the sponge called the osculum. In more complex body plans, there is no spongocoel but several smaller chambers lined with choanocytes |
First Time Here?
Welcome to Quizlet, a fun, free place to study. Try these flashcards, find others to study, or make your own.