Body Fluid Compartments Flashcards
Define Isosmotic
no change in body fluid osmolarity
Define Hyperosmotic
Body fluid osmolarity is increased
Hyposmotic
Body fluid osmolarity is decreased
2/3 of the water compartment in the body is ____
intracellular fluid
____ makes of 1/3 of the water content in the body.
ECF
ECF is composed of ____ and ____
Interstitial Fluid
Plasma
What seperates ICF from ECF
Cell Membrane
What seperates Interstitial Fluid from Plasma
Capillary Wall
Water added to the body fluids always enters the ____ compartment first
ECF
Fluids always leaves the body via the ____
ECF
____ is the intermediary between cells and teh external enviroment
ECF
How can you regulate interstitial fluid?
Regulate Plasma
What is the only fluid that can be acted on diretly to control its volume and composition
Plasma
Any control mechanism that operates on ___ in effects regulate the entire ECF
Plasma
Cell have NaCl concentration equal to ____
0.85%
What are main solutes ECF:
1) Sodium
2) Glucose
3) Urea
Osmolarity Equation
(Sodium * 2) + Glucose/18 + BUN/2.8
Plasma Osmolality Equation
2 (plasma [Na+])
Vasopressin is secreted in response to:
1) Angiotensin II
2) Atrial receptors in presences of low preload
3) Increased osmolality of blood
4) Sympathetic Nervous System activation
What are two actions of Vasopressin? what does it lead to>
1) Blood Vessel Constriction
2) Kidneys Fluid Reabsorption
3) Increased arterial pressure
What stimulates ANP/BNP?
1) ANP: Increased secretion by excessive preload of atria
2) BNP: Increased secretion by excessive preload of ventricles
ANP Functions
1) Arteriolar Dilation Decreases TPR
2) Increases fluid loss - decreases preload
3) Inhibits renin - decreases both TPR and preload
4) Directly inhibits Na+ reabsorption in distal parts of nephron
5) Inhibits aldosterone secretion
6) Inhibits secretion and actions of vasopressin
Hyponatremia: What does water movement cause?
Symptoms related to hypovolemia and cellular swelling
Hypernatremia: What does water movement cause?
Intracellular Dehydration including shrinkage of brain cells; but there is excess ECF
