Fluids

Question 1

Osmosis

Answer 1

Movement of water molecules across semi-permeable membrane from lower to higher solute concentration until equilibrated. Passive process.

Question 2

Osmotic pressure:

Answer 2

force with which water passes through membrane separating solutions of different concentrations.

Question 3

Diffusion

Answer 3

Movement of solute molecules from higher to lower concentration until equilibrated.
Occurs in liquids, gases and solids.
Passive process

Question 4

Hydrostatic Pressure

Answer 4

Pushing force of water, in a fluid compartment, exerting pressure against membrane wall.

Question 5

Oncotic Pressure

Answer 5

Osmotic (pulling) pressure exerted by plasma colloids in solution. usually 25mm Hg

Question 6

Natriuretic Peptides

Answer 6

Natural antagonists to RAAS
Produced in response to high blood volume & high sodium.
Function:
Suppresses excretion of aldosterone, renin & ADH;
decreases action of angiotensin II;
Promotes excretion of sodium & water