Which of the following properties does not pertain to the arterioles?
a. Their radii remain constant.
b. Their walls contain a relatively thick layer of smooth muscle.
c. They are responsible for the distribution of blood flow to the various organs.
d. They are the major vessels that contribute to total peripheral resistance.
e. They are richly innervated by sympathetic nerve fibers.
A
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The major metabolic effects of glucagon include
A. stimulating glycogenolysis and gluconeogenesis in the liver. B. stimulating the activity of glycogen synthase in the liver. C. inhibiting the enzyme glycogen phosphorylase in the liver. D. stimulating glucose uptake into skeletal muscle cells. E. stimulating triglyceride synthesis in adipose tissue.
A cation that often acts as a cofactor for enzymes is
A) sodium. B) potassium. C) calcium. D) magnesium. E) zinc.
Manufacturers of some medications used to treat heartburn advertise that their products shut down the acid-producing pumps in the stomach. Where are these "acid-producing pumps"? In other words, which type of gastric gland cell secretes acid?
A. Chief cells B. Parietal cells C. Mucous neck cells D. Surface mucous cells E. Enteroendocrine cells
________ stimulates Ca2+ deposition by osteoblasts and Ca2+ excretion by the kidneys.
A. Parathyroid hormone B. Thyroid hormones C. Calcitonin D. Aldosterone