Physiology of the Urinary System
53. What is the hormonal control mechanism for the renal flow?
54. Angiotensinogen is a pre-enzyme produced by the ___ and freely circulates in the blood.
55. When blood pressure drops, the enzyme ____ is released by the juxtaglomerular (JG) cells
of the nephron.
56. In the ____, angiotensin I is converted to ____.
57. Once circulating angiotensin II reaches the adrenal cortex, it causes the release of the
58. What is reabsorption?
59. True or false: all reabsorption occurs in the renal tubules by diffusion.
60. Where does the greatest amount of renal tubular reabsorption occur?
61. About what percentage of Na+ is reabsorbed in the PCT? The loop of Henle? The DCT?
62. What is secretion?
63. What is countercurrent flow?
64. When an osmotic gradient is isosmotic, what does this mean?
65. What is the concentration of the filtrate in the PCT vs. the bottom of the loop of Henle?
66. True or False: The descending and ascending regions of the loop of Henle have the same