Digestive+systems

Digestive systems:

//Your team will be researching various methods of ingestion, digestion and egestion. Below are your assigned organisms along with some key body parts, processes and terms which should be included in your presentation. Divide these fairly among you plus the additional general tasks as listed here and in the descriptor://


 * Define the basic function of a digestive system


 * Explain the difference between ingestion vs digestion vs egestion, then be sure to include how each organism does each of these- in most cases it is just giving a body part but for some explanations will be needed


 * Explain the difference between incomplete vs complete digestion as well as extracellular digestion- also indicate which term applies as each organism is presented.

__Organisms__: include these terms and their role in digestion; label any body parts in diagrams. (Anus has been placed with one organism but is present in several of them).

1. Planaria: pharynx

2. Jellyfish: gastrovascular cavity; nematocysts

3. Earthworm: gizzard; crop; anus

4. Clam: incurrent and excurrent siphon; role of gills

5. Sponge: choanocytes (also known as collar cells); amebocytes; osculum

6. Starfish: water vascular system; tube feet

7. Spider: pedipalps

8. Snake: hinged jaw; cloaca