Living Environment Regents Review Practice Organization of Life Question 3
Monday, 29 June 2009 10:19
The main function of the human digestive system is to
A)Rid the body of cellular waste materials
B)Process organic molecules
C)Break down glucose in order to release energy
D)Change amino acids into proteins and carbohydrates
Correct Answer: Option B - Process organic molecules
Digestion is the mechanical and chemical breaking down of food into smaller components, to a form that can be absorbed, for instance, by a blood stream. Digestion is a form of catabolism.
In mammals, food enters the mouth, being chewed by teeth, and broken down by the saliva from the salivary glands. Then it travels down the esophagus into the stomach. Acids break down most of the food. The "leftovers" go through the small intestine, through the large intestine, and are excreted during defecation.
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