Which of the following does not enhance the absorptive effectiveness of the small intestine?
A) circular folds
B) villi
C) microvilli
D) intestinal movements
E) cilia
Answer: E
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A family of peptides called ________ are released by the endothelium and are among the most potent vasoconstrictors known
Fill in the blanks with correct word
______ are masses of partially encapsulated lymphatic nodules in the pharynx
Fill in the blank(s) with correct word
An intestinal hormone that stimulates mucus secretion by the submucosal duodenal glands and dilation of intestinal capillaries is
A) secretin. B) cholecystokinin. C) vasoactive intestinal peptide (VIP). D) gastric inhibitory peptide (GIP). E) gastrin.
The sodium-potassium (Na+-K+) pump transports both sodium and potassium ________ their concentration gradients in a process called ________
A) down; countertransport B) up; active transport C) up; cotransport D) down; active transport E) up; facilitated transport