A sphincter is a
A. thickening of the longitudinal layer of the muscularis that propels materials through the GI tract.
B. thickening of the circular layer of the muscularis that controls movement of materials through the GI tract.
C. fold of the mucosa of the GI tract that increases the total surface area for absorption of nutrients.
D. circle of adventitia that anchors the GI tract to neighboring structures.
B
You might also like to view...
C) sodium, potassium, or calcium
A) any type of channel closing. B) closing of the channel even when the stimulus continues. C) closing of the channel in response to decrease in the stimulus. D) None of the answers are correct.
Emesis is a medical term for:
A) excessive thirst B) vomiting C) malnutrition D) dehydration E) diarrhea
Mature bone matrix is composed of ______ material like collagen and proteoglycans and ______ material like hydroxyapatite.
a. inorganic, organic b. organic, inorganic c. sythetic, organic
These cells contain histamine and are the least numerous of the circulating white blood cells.
A. Monocytes B. Eosinophils C. Neutrophils D. Basophils