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31 Cards in this Set
- Front
- Back
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What are some of the variations that capillaries can have? (4)
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1. Tight junctions
2. Pores 3. Vesicles 4. Fenestrations |
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What type of transport is good only over short distances?
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Diffusion
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What is flux =?
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Flux = DA (dc/dx)
D= diffusion (permeability) coefficient A= area available for exchange dc/dx= gradient driving exchange (potentai energy) |
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What type of transport accounts for most (90%) of transcapillary food movement?
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Diffusion
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What is filtration?
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Bulk flow over good distances
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Equation for filtration?
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F= ∆P x k
∆P= hydrostatic pressure - tissue pressure k= capillary filtration coefficient |
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Is hydrostatic pressure greater on the arterial end or venous end?
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Hydrostatic pressure is greater on arterial end than venous
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Why is hydrostatic pressure on venous end 15 mmHg?
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That is the pressure that drives the blood back up to the vena cava
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What is reabsorption?
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Net movement of fluid into capillary
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What is edema?
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Accumulation of fluid in interstitial fluid
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Reabsorption occurs on which end of the capillary?
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Reabsorption occurs on venous end of capillary
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What is oncotic pressure?
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Large impermeable proteins create a concentration gradient for water movement across capillary wall
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What is the dominant force promoting reabsorption?
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Oncotic pressure
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What is osmotic pressure?
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Movement of water up a gradient due to small freely permeable (ionic) solutes
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What effect does osmotic pressure have on filtration or reabsorption?
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Osmotic pressure-- little effect on filtration or reabsorption
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What is the Starling-Landis equilibrium?
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Starling-Landis Equilibrium:
When filtration = reabsorption |
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What happens when fitration > reabsoprtion?
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interstitial fluid volume rises --> edema, swelling
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What happens when reabsorption > filtration?
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Interstitial fluid volume decreases --> dehydration
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What happens to proteins when infection occurs?
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Infection --> can have protein leak into interstitial space
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What are the functions of the lympatic system? (4)
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1. Returns escaped protein into thoracic duct
2. Moves fluid passively via valves 3. Aids in fat transport during digestion 4. Immune system highway organized into nodes |
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What can decrease filtration? (5)
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1. Decrease arterial pressure
2. Increase arterial resistance 3. Decrease post-capillary venular resistance 4. Increase tissue pressure 5. Decrease capillary filtration coefficent |
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What can decrease reabsorption? (2)
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1. Decrease plasma protein concentration
2. Increase interstitial protein concentration |
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Venous thrombrosus causes?
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Increase post-capillary resistance --> Increase filtration
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Inflammation causes?
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Increase capillary filtration coefficient --> Increase filtration
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Hypertension causes?
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Increased arterial pressure --> Increased filtration
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Hemmorrhage causes?
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Decreased arterial pressure --> Decreased filtration
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Arterial clots cause?
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Increased arterial resistance --> Decreased filtration
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Compression causes ?
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Increased tissue pressure --> Decrease filtration
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Hyperproteinemia causes?
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Increased plasma protein concentration --> Increased Reabsorption
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Inflammation or burn cause?
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Increased capillary protein permeability --> increased interstitial protein concentration --> Decreased reabsorption
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Infection causes?
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Increased interstitial protein concentration --> Decreased reabsorption
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