Question

the digestive system processes food into usable and unusable materials. the usable materials are sent to the cells as nutrients through the circulatory system. what happens to the unusable solid material? a. the nervous system moves it to the kidneys where it is eliminated. b. the circulatory system moves it to the heart and lungs to be eliminated. c. the respiratory system moves it to the heart and lungs to be eliminated. d. the muscular system moves it to the large intestine and rectum to be eliminated.

Explanation:

The muscular system plays a role in the final stages of the digestive - process by moving undigested food (unusable solid material) through the large intestine and rectum for elimination. The circulatory system is mainly for transporting nutrients and oxygen, not for eliminating solid waste. The respiratory system deals with gas exchange and not solid - waste elimination. The nervous system controls and coordinates body functions but does not directly move solid waste for elimination.

Answer:

D. The muscular system moves it to the large intestine and rectum to be eliminated.