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NUR 339 Exam 16
- Movement of solutes from area of high concentration to low concentration-
Answer Diffusion
- Movement of water from area of fewer solutes to more solutes
Answer Osmosis
- Movement of solutes from area of lower concentration to higher concentra- tion (requires
energy)
Answer Active Transport
- Pressure needed to oppose movement of water across membrane
Answer Osmotic Pressure
- Normal osmolality range
Answer 280-295 mOsm/kg
- Tension or effect that osmotic pressure of solution with impermeable solutes exerts on cell
size due to H2O movement across the membrane
Answer Tonic- ity
- Osmolar concentration in 1 kg of water
Answer Osmolality
- Pressure pushing water out of capillary into interstitial spaces 1 / 2
Answer Capillary Filtration Pressure
- Osmotic pressure generated my plasma proteins too large to pass through pores of capillary
wall (pulls fluid back into capillaries)
Answer Capillary Colloidal Osmotic Pressure
- What can cause increased capillary filtration pressure?
Answer Increased venous pressure, capillary distention due to increased vascular volume (ex
Answer CHF)
- What can cause decreased capillary colloidal osmotic pressure?
Answer De- creased # of plasma proteins due to loss/low production (liver/kidney disease, malnutrition)
- How does ADH work?
Answer Osmoreceptors sense increased osmolarity and stim- ulate thirst center in hypothalamus which increases absorption of H20 and Na from kidney (causing less urine production)
- How does the renin-angiotensin-aldosterone-system work?
Answer Stimulated by baroreceptors (sense low blood volume), increases absorption of Na and H2O from kidney and secretes K
- What is 3rd spacing
Answer Loss/Trapping of ECF in transcellular space (pericardial sac, peritoneal cavity, pleural cavity)
- How does increased capillary permeability cause edema and 3rd spac- ing?
- / 2
Answer Damage to capillary walls or inflammation causes particles to leak into the interstitial space
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