Where are androgens, such as testosterone, produced?
A) seminiferous tubules of the testis
B) interstitial cells of the testis
C) epididymis
D) bulbourethral glands
E) prostate
B
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What major anion binds with calcium in bones?
A. Collagen B. Potassium C. Phosphate D. Chloride
Which of the following best describes juxtaglomerular cells?
A. They are target cells for aldosterone. B. They are found in the distal convoluted tubule. C. They are modified smooth muscle cells found in the afferent arteriole. D. They respond to parasympathetic stimulation. E. They occupy the cleft between the afferent and efferent arterioles.
Asters radiate away from the mitotic poles and are made of
A. microtubules. B. nucleoplasm. C. chromatin. D. actin.
Which of the following statements regarding calcium homeostasis is true?
A. When blood calcium levels are too low, osteoclast activity increases. B. Parathyroid hormone increases calcium loss from the kidney. C. Increased osteoblast activity increases blood calcium levels. D. Calcitonin elevates blood calcium levels. E. Parathyroid hormone inhibits osteoclast activity.