Digestive and Excretory System
Crayfish Dissection for Biology 110
Penn State Altoona Biology
VI.) Digestive and Excretory Systems
1. Trace the digestive system from the mouth through the esophagus to the cardiac stomach, where the food is ground up.
2. From the stomach, food travels to the intestine, where it is absorbed into the blood stream.
3. Next, food waste is expelled through the anus.
4. Find the green gland located internally just behind each antenna and right under the brain. These structures filter fluid waste from the blood.