Which correctly describes renin?
A. It is secreted by juxtaglomerular cells in renal afferent arterioles.
B. Its secretion is enhanced by high levels of Na+ in the macula densa.
C. Its secretion is stimulated by elevated blood pressure in the renal afferent arterioles.
D. It acts on the adrenal cortex to stimulate aldosterone secretion.
E. It is secreted by the liver in response to low blood pressure.
A
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The portion of the nephron that empties into the collecting duct is the
A) nephron loop (loop of Henle). B) proximal convoluted tubule. C) distal convoluted tubule. D) papillary tubule. E) calyx.
Hemoglobin that has released its O2
A. is broken down to heme and globin and excreted. B. loses its affinity for O2. C. will dissolve in the plasma. D. will bind more readily to CO2. E. will bind more readily to O2.
Which of these muscles is located on the ventral (anterior) side of the body?
A) pectoralis major B) occipitalis C) gastrocnemius D) gluteus medius E) latissimus dorsi
Which of the following cell types is diploid?
A. spermatid B. mature sperm C. primary spermatocyte D. secondary spermatocyte E. spermatozoa