Question

question 1
peristalsis is regulated in part by the intrinsic stretch reflexes. it is also thought to be stimulated by the hormone
gastrin.
secretin.
glucagon.
cholecystokinin (cck)
question 2
watch the following animation to see how swallowing is a complex process that involves the nervous system to coordinate the actions of upper respiratory and digestive activities.
during which stage of swallowing is there a risk of food entering respiratory pathways?
oropharyngeal
esophageal
chemical digestion
mastication

Explanation:

Question 1

Peristalsis (intestinal muscle contractions) is regulated by intrinsic reflexes and hormones. Gastrin stimulates gastric acid and motility, including peristalsis. Secretin, glucagon, and CCK have other primary roles (e.g., secretin for bicarbonate, glucagon for glucose, CCK for digestion). So gastrin is the hormone that stimulates peristalsis.

Swallowing has stages: oropharyngeal (voluntary/involuntary, food moves to pharynx), esophageal (peristalsis to stomach), mastication (chewing), and chemical digestion (not a swallowing stage). The oropharyngeal stage involves the pharynx, where the epiglottis must close to prevent food from entering the trachea (respiratory pathway). If this fails, food can enter respiratory pathways here.

Answer:

A. gastrin

Question 2