Regulation Of Fluid Volume

Question 1

Kidneys

Answer 1

Primary regulator of body fluids and electrolyte balance

Question 2

Hormones- ADH

Answer 2

Anti diuretic hormone- regulates water excretion from the kidneys synthesized in the anterior hypothalamus.
When serum osmolality ⬆️ ADH is produced, causing the collecting ducts to become more permeable to water.

Question 3

Hormones- RAAS System

Answer 3

Renin-angiotensin Aldosterone system
Changes in renal perfusion initiates RAAS system. If bl flow or pressure to the kidneys ⬇️, renin is released. Renin causes the conversion of angio - angio I, then to angio II by ACE released by the lungs. Angio II promotes vasoconstriction & acts on nephrons to promote Na & h2o retention. Also stimulates the release of aldosterone, which also promotes Na retention. Restores bl volume and renal perfusion thru Na and h2o retention.

Question 4

Thirst

Answer 4

Relieved immediately , but it comes back within 15 minutes

Primary regulator of fluid intake - hypothalamus