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14 Cards in this Set
- Front
- Back
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what happens in osmosis?
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flow of water through a semi-permeable membrane, from a compartment where the solute concentration is lower, to the side of the membrane where the solute concentration is higher. Water flows from the region of higher water concentration to the side with lower water concentration.
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what is a semipermeable membrane?
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A semipermeable membrane is a membrane that is permeable to water and impermeable to solute
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what is the difference between diffusion and osmosis?
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1. Diffusion means dissolving in the phospholipid bilayer.
2. Osmosis means water moving through membrane pores (aquaporins) as hydraulic flow. |
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what would happen if a cell where placed in pure water?
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it would lyse
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what is osmolarity?
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the molar concentration of ideal particles in the solution. It’s the sum of all the solutes
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what is tonicity of solution?
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the long-term steady state volume of the cell, and
depends on the concentration of impermeable solutes. |
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If a cell is placed in an isotonic solution it will...
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maintain its volume
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If a cell is placed in a hypertonic solution, it will....
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shrink
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If a cell is placed in a hypotonic medium it will...
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swell
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Is sweat hypotonic, isotonic or hypertonic?
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hypotonic. more water than salt
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What types of fluids should be consumed to re-hydrate following aerobic exercise?
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Water only
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What type of fluid could reduce the swelling of the brain following traumatic brain injury?
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diuretics (hypertonic) increase ECF solute concentration pulling fluid out of tissues
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What causes excessive urine flow in untreated diabetics?
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In diabetics, the sugar in the blood increases the blood's osmolality. This tends to pull fluid out of tissues and into the bloodstream (through osmosis). Your kidneys get an increased fluid load delivered to them and make more urine because of it
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What is the origin of ankle edema (swollen ankles)?
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kidney disease is not regulating fluid solute levels
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