26.2 Water balance & ECF osmolaltiy, antidiuretic hormone (ADH)

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8 Terms

1
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  • Volume of urine excreted and solute concentration also depend on

  • fluid intake,
    diet, and water loss via other avenues

2
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  • Rise in osmolality

  • Stimulates thirst

  • Causes ADH release

3
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  • Decrease in osmolality

  • Causes inhibition

  • Causes ADH inhibition

4
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  • Water reabsorption in collecting ducts is

proportional to ADH release

5
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  • Decreased ADH leads to

  • dilute urine and drop in volume of body fluids

6
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  • Increased ADH leads to

  • concentrated urine, due to reabsorption of water, causing increased volume of body fluids

7
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  • Hypothalamic osmoreceptors sense ECF solute concentration and regulate

  • ADH accordingly

8
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  • “Large” changes in blood volume or pressure

  • Decreased BP causes increased ADH release due to blood vessel baroreceptors and renin-angiotensin-aldosterone mechanism