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What is capillary permeability and how does plasma Ca2+ concentration affect it?
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Capillary permeability (CP) refers to how easily substances can pass through the walls of capillaries. It determines the filtration coefficient, which is the volume of fluid filtered per mmHg per minute.
For example, the plasma Ca²⁺ concentration affects CP. If the plasma Ca²⁺ concentration increases, the capillary pores narrow, which decreases the capillary permeability. Conversely, if the plasma Ca²⁺ concentration decreases, the pores widen, and CP increases.
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