Describe the relationship between blood velocity and blood vessel cross-sectional area.
Capillary Exchange
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Module: Distribution
Activity: Animations
Title: Capillary Exchange
Introduction
- Describe the relative movement of oxygen, carbon dioxide, and other wastes, between capillaries and living cells.
Mechanisms of Capillary Exchange
- a. Describe the importance of diffusion as a method of capillary exchange.
- Describe movement of small or lipid soluble molecules across the endothelial cell membrane.
- Describe movement of medium-sized, or lipid insoluble soluble substances across the endothelial cell membranes.
- Describe transcytosis. Include endocytosis and exocytosis in your explanation.
- a. What does bulk flow transport?
- How do pressure gradients affect bulk flow?
- Describe the function of capillary fenestrations.
Bulk Flow
- Describe the correlation between bulk flow and the relative volumes of blood and interstitial fluids.
- Explain each of the following factors that determine the net direction of capillary exchange.
Blood Hydrostatic Pressure (BHP) –
Blood Colloid Osmotic Pressure (BCOP) –
Interstitial Fluid Osmotic Pressure (IFOP) –
Interstitial Fluid Hydrostatic Pressure (IFHP) –
- Define Net Filtration Pressure (NFP).
- a. Describe filtration and reabsorption pressures at each of the following capillary locations.
Arterial End –
Venous End –
- How much of the water that is filtered out of the arterial end of the capillary is reabsorbed at the venous end?
- What happens to the interstitial fluid not reabsorbed into the venous capillaries?
- a. Define edema.
- Name four major causes of edema.
Blood Velocity
- a. Describe the relationship between blood velocity and blood vessel cross-sectional area.
b. Why is slow blood velocity important in the capillaries?
12. Describe blood velocity patterns as blood moves away from, and then back toward, the heart.