Explore BrainMass

Capillaries and Exchange Nutrients

This content was STOLEN from BrainMass.com - View the original, and get the already-completed solution here!

How does exchange of nutrients, wastes and gasses occur at the capillary level? What two pressures are involved and how do they create a difference in net pressure from the arterial end to the venous end of the capillary? Please be specific.

© BrainMass Inc. brainmass.com October 24, 2018, 5:49 pm ad1c9bdddf

Solution Preview

The capillaries offer a huge surface area for exchange of nutrients, water, oxygen, carbon dioxide, waste materials, etc. between the plasma and the interstitial space around the cells. While small molecules (like those in the previous sentence) can easily move across capillary walls, usually plasma proteins and blood cells are trapped inside the capillaries. The movement of water containing other small molecules between the inside of the capillary and the interstitial fluid surrounding the capillary is due to a balance of forces across the capillary wall. Water and small molecules dissolved in the water move by bulk flow (like sand washed down with the river) across capillary walls. Bulk flow is a passive transport process similar to simple diffusion. Movement of water and solutes out of the capillary is called filtration, while ...

Solution Summary

The solution discusses how nutrients, wastes and gasses are exchanged at the capillary level.

See Also This Related BrainMass Solution

Learning about the Circulatory System

1) How does the decrease in vital capacity potentially influence an individual's athletic performance or aerobic condition as aging occurs?

2) What is the functional nature of a "portal system" and how does it differ from normal venous return flow?

3) Why might a clot in the lungs (a pulmonary embolism) occur after a deep vein thrombosis in the leg?

4) Name the section of descending aorta inferior to the diaphragm?

View Full Posting Details