Question

what of the following stimulates stomach secretory activity during the cephalic phase?
a.) stretch receptors are activated by stomach distension
b.) thinking of foods you enjoy eating
c.) presence of low ph and, in the duodenum, partially digested food, as the stomach empties
d.) emotional distress

Explanation:

The cephalic phase of digestion is triggered by sensory stimuli (sight, smell, thought of food). Stretch receptors (a) are part of the gastric phase (stomach distension). Low pH and partially digested food (c) relate to the intestinal phase. Emotional distress (d) doesn't stimulate normal stomach secretory activity in the cephalic phase. Thinking of enjoyable foods (b) is a cephalic - phase trigger.

Answer:

B. Thinking of foods you enjoy eating