How many neurons make up the brain?
A. 1 million
B. 100 million
C. 1 billion
D. 100 billion
E. 1 trillion
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Other quiz: Homeostasis, Nutrition, Digestion & Absorption
The stomach wall produces mucus to cover its surface. Which of the following statements correctly describe(s) the function of the mucus?
(1) It kills the bacteria in the ingested food.
(2) It prevents the rubbing of food against the stomach wall.
(3) It protects the stomach wall from the action of the digestive enzymes.
A. (1) only
B. (3) only
C. (1) and (2) only
D. (2) and (3) only