The pharyngoesophageal sphincter is normally closed to prevent
a. air from entering the esophagus during breathing
b. gastric contents from refluxing back into the esophagus
c. vomiting
d. esophageal secretions from leaking into the stomach
e. food from entering the pharynx
A
You might also like to view...
Epithelial tissues always exhibit polarity; that is, they have a free surface and a basal surface
Indicate whether the statement is true or false
A molecule that loses electrons during a reaction is
A) oxidized. B) dehydrated. C) reduced. D) hydrated.
List and explain the effects of cortisol.
What will be an ideal response?
Most sodium reabsorption is driven by the Na+/K+ pump located in what region?
A) proximal tubule basolateral membrane B) proximal tubule apical membrane C) intercalated cells basolateral membrane D) principal cells basolateral membrane E) principal cells apical membrane