the mechanism known as "negative feedback" controls the amount of hormones secreted into the bloodstream
a. true
b. false
a. true
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The epithelium of the seminiferous tubules consists of
A. spermatogonia and spermatids. B. interstitial cells and sustentacular cells. C. adipose cells and chondrocytes. D. spermatogenic cells and sustentacular cells.
The largest volume of water in the body is:
a. plasma b. the fluid inside the cells c. interstitial fluid d. lymph
Which of the following is not true concerning the control of calcium metabolism?
a. PTH (parathyroid hormone) causes an increase in plasma calcium by activation of osteoclasts. b. PTH increases renal reabsorption of calcium. c. vitamin D causes an increase in secretion of Ca2+ into the lumen of the digestive tract. d. calcitonin causes a decrease in plasma calcium by decreasing Ca2+ movement from the bone fluid into the plasma and by suppressing bone resorption. e. when plasma calcium increases, PTH decreases and calcitonin increases.
Two solutions are separated by a selectively permeable membrane. If solution A has a higher concentration of a nonpermeating solute than solution B, then ________.
A. water will pass down its concentration gradient from solution B to A B. the solute will pass down its concentration gradient from solution B to A C. neither the solute nor water will diffuse D. water will pass down its concentration gradient from solution A to B E. the solute will pass down its concentration gradient from solution A to B