Fluid Regulation

• What part of the brain stimulates or inhibits the desire to drink?

  Hypothalamus
• What triggers the release of renin in the kidneys?

  Decrease in perfusion to kidneys
• What does renin convert angiotensinogen into?

  Angiotensin I
• Where is angiotensin I converted to angiotensin II?

  In the lungs
• What are the effects of angiotensin II?

  Vasoconstriction, stimulate thirst, retain water and Na
• What does Atrial Natriuretic Peptide (ANP) do?

  Inhibits the Renin-Angiotensin-Aldosterone System
• What stimulates the release of Antidiuretic Hormone (ADH)?

  Changes in blood osmolality
• What is the function of ADH in the kidneys?

  Stimulates retention of water
• How does the hypothalamus interact with the Renin-Angiotensin-Aldosterone System?

  It stimulates thirst in response to angiotensin II
• What is the relationship between blood osmolality and ADH secretion?

  Higher osmolality increases ADH secretion