If wastes are not removed, poison will build up in body tissues resulting in sickness or eventually death. A. Large Intestine 1. Removes excess water from food which cannot be digested.
Wastes leave the body through the anus.
B. Lungs 1. Approximately 10cm in length 3. Blood passes through the kidneys during renal circulation and is filtered. Structure a. Cortex - part of the kidneys which filters wastes out of theblood. Medulla - part of the kidneys where wastes drain off and form urine.