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23 Cards in this Set
- Front
- Back
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Exchange of fluid can move between two ECF components. What are the components of ECF?
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o Blood plasma (proteins)
o Interstitial fluid |
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Filtration and Reabsorption
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Determined by the balance of hydrostatic and colloid osmotic pressure ACROSS capillary membrane
o Fluid moving across the capillary membrane to and from the plasma and interstitial fluid |
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Osmosis
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determined by the osmotic effect of smaller solutes. Water moves across the cell membrane rapidly, all other polar and charged substances require specific transporters.
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During osmosis, where is water moving?
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Across the cellular membrane to and from the interstitial and intracellular fluid
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Which direction does water move?
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In the direction that reflects osmotic strength between ICF and ECF
o Water moves from hypotonic to hypertonic to equilibrate the osmotic equilibrium |
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Movement across the capillary membranes depends on what?
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Movement across capillary membranes is by nonselective permeability.
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Movement across capillary membrane is characterized by...
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...a relatively nonselective permeability to small molecules (ions, glucose, amino acids) which can freely move across most capillaries
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Transport in and out between the ICF and ECF has to cross...
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...cross the cell membrane of cells
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Which molecules cannot freely move across and require transporters or ion channels?
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Polar and charged substances
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Body fluid homeostasis is maintained by...
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water is a substance that moves more easily across the membrane because it moves by osmotic forces
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Interstitial fluid
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11.0 L
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Intracellular fluid
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28.0 L
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Plasma
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3.0 L
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Extracellular fluid
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14 L
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Ionic Composition of Extracellular and Intracellular Fluids
• Extracellular has cations which means there's more... |
More Sodium - Na+
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Ionic Composition of Extracellular and Intracellular Fluids
• Extracellular has anions which means there's more... |
More Chloride and CO3-
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Ionic Composition of Extracellular and Intracellular Fluids
• Intracellular has cations which means there's more... |
More Potassium - K+
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Ionic Composition of Extracellular and Intracellular Fluids
• Intracellular has anions which means there's more... |
More phosphate and protein
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Regulation of Water Movements: Osmosis
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• Net diffusion of water across a selectively permeable membrane from a region of high water concentration (hypotonic solution) to one that has a lower water concentration (hypertonic solution)
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Hypotonic
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Cell swells
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Hypertonic
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Cell shrinks
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Isotonic
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No change (5% glucose or normal saline)
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Where does filtration and reabsorption occur?
Where does osmosis occur? |
Capillary membrane is nonselective
Cell membrane is selective |
