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capillary exchange
capillary exchange
26
Anatomy
Undergraduate 1
09/28/2008

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Cards

Term
What are the three types of capillary exchange
Definition
diffusion, transcytosis, bulk transport
Term
What is capillary exchange
Definition
the movement of substances in and out of the capillary
Term
What is edema
Definition
a swelling caused by an abnormal increase in interstitial fluid
Term
What is the most important method of capillary exchange
Definition
diffusion
Term
What is diffusion
Definition
the movement of substances down their concentration gradient
Term
What substances are diffused through continuous capillaries
Definition
oxygen, hormones, amino acids, glucose, carbon dioxide
Term
What capillaries allow larger substances to diffuse across them
Definition
fenestrated and sinusoid capillaries
Term
Where is diffusion across capillaries restricted and why
Definition
in the brain due to the blood brain barrier
Term
How are substances transported in transcytosis
Definition
from the blood into the endothelial cell via endocytosis then out of the endothelial cell to the other side via exocytosis
Term
What substances utilize transcytosis and give two examples
Definition
large lipid insoluble substances such as insulin and antibodies
Term
What is bulk transport
Definition
the movement of a large amount of substances in fluid down a pressure gradient
Term
What two processes are involved in bulk transport
Definition
filtration and reabsorption
Term
What is filtration
Definition
the flow of liquid out of the capillaries and into the interstitial fluid
Term
What force is filtration driven by
Definition
blood hydrostatic pressure
Term
What is blood hydrostatic pressure
Definition
the force the water in the blood exerts on the vascular walls
Term
What is reabsorption
Definition
the movement of fluid from the interstitial fluid into the capillary
Term
What force is reabsorption driven by
Definition
blood colloid osmotic pressure
Term
What is the function of filtration and reabsorption
Definition
to balance the levels of interstitial fluid and blood volume
Term
What are the BHP and BCOP values at the arterial end of a capillary
Definition
BHP is 35 BCOP is 26
Term
What process happens at the arterial end of the capillary
Definition
filtration
Term
What are the BHP and BCOP values at the venous end of the capillary
Definition
BHP is 16 BCOP is 26
Term
What process happens at the venous end of the capillary
Definition
reabsorption
Term
How much fluid is filtered out of the capillaries daily
Definition
20L
Term
How much fluid is reabsorbed by the capillaries daily
Definition
17L
Term
What happens to the 3L of fluid that is not reabsorbed by the capillaries
Definition
it is picked up by lymphatic vessels and eventually returned to the blood stream
Term
What causes edema (in terms of pressure)
Definition
increased BHP decreased BCOP
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