Which of the following regulates the flow of contents from the stomach to the duodenum?
A. Gastric rugae
B. Esophageal sphincter
C. Pyloric sphincter
D. Ileocecal valve
E. Cardiac sphincter
C. Pyloric sphincter
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If blood oxygen levels are reduced, cells in the kidney respond by secreting the hormone ________.
Fill in the blank(s) with the appropriate word(s).
Protein hormones are
A. lipid-soluble. B. water-soluble. C. soluble in both water and lipids. D. soluble in neither water nor lipids.
The specificity of hormones is due to
a. specialized hormone secretion. b. molecular rearrangement at the site of action. c. specific binding of hormones to plasma proteins. d. specialization of target-cell receptors. e. inactivation of hormones by the kidneys.
What protein is found in the nails, hair, and epidermis?
A. keratin B. collagen C. melanin D. elastin E. carotene