In one kind of second-messenger system,
a. a small amount of one hormone (second messenger) is required to release another
b. a tropic hormone (first messenger) stimulates secretion of another hormone (the second messenger)
c. the hormone binds to a specific surface receptor, whereupon the hormone-receptor complex moves into the cell to combine with an intracellular receptor
d. releasing hormones (first messenger) from the hypothalamus regulate anterior pituitary hormones (second messengers)
e. a hormone (first messenger) binds to surface receptors that activate adenylate cyclase, which then catalyzes cAMP formation
E
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If you stand on tiptoes to reach something high, you are performing ________ at the ankle.
A. dorsiflexion B. plantar flexion C. abduction D. opposition E. eversion
Which of the following are nerves of the posterior division of the brachial plexus?
A) axillary nerve B) radial nerve C) musculocutaneous nerve D) ulnar nerve E) both radial and axillary nerves
Answer the following statements true (T) or false (F)
1. Before food can be assimilated, it must be metabolized. 2. About 75% of the energy released by glycolysis and the citric acid cycle is in the form of ATP. 3. ATP has three high energy bonds, whereas ADP has only two. 4. The normal concentration of glucose in the blood is 80-120 mg per 100 mL of blood. 5. A drop in insulin production can produce a drop in the blood glucose level.
The movement of substances out of the renal tubules into the blood capillaries is called:
a. reabsorption b. glomerular filtrate c. secretion d. none of the above