Physiology of the urinary system 53 what is the

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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 hormone ____.
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 reabsorption characteristics.
false 67. True or False: The concentration of urea is relatively low in the distal convoluted tubule and the cortex regions of the collecting ducts because the tubules in the cortex are permeable to it.
68. ADH is secreted by the ____.
69. True or False: ADH increases water output.
70. Describe the action of ADH.

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