Secondary hyperthyroidism due to a pituitary tumor would be associated with the following thyroid gland histophysiology (relative to normal):
A. increased iodine uptake at 24 hr
B. increased colloid
C. tall columnar thyroid epithelium
D. decreased thyroglobulin endocytosis
E. lowered organification of iodide
ANS: C
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A group of nerve cell bodies located outside the central nervous system is called a:
a. nerve b. ganglion c. nucleus d. column e. commissure
Blood supply to the proximal and distal convoluted tubules of the nephron is provided by the __________.
a. segmental veins b. afferent arterioles c. interlobular veins d. peritubular capillaries
In order for muscle relaxation to occur,
A. calcium ions must be transported to troponin. B. power strokes slow down. C. the active sites on actin must be blocked. D. sodium ions must be actively transported to troponin. E. the active sites on myosin must be uncovered.
Angiotensin II
A. is a potent vasodilator. B. stimulates aldosterone secretion. C. is formed from angiotensin I by the action of renin. D. acts on the collecting ducts to increase reabsorption of water. E. decreases blood pressure.