Multiple choice

Which among the following statements regarding the human digestion process is INCORRECT?

  1. Digestion begins from the mouth of an organism.

  2. Gastric acid is about 0.5% hydrochloric acid.

  3. The gastric phase is stimulated by distension of the stomach.

  4. The gastric phase occurs at the sight, thought and smell of food.

  5. The human gastrointestinal tract is around 9 m long.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Different phases of digestion take place including the cephalic phase, gastric phase and intestinal phase. The cephalic phase occurs at the sight, thought and smell of food, which stimulate the cerebral cortex. Taste and smell stimuli are sent to the hypothalamus and medulla oblongata.

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