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Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892

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BuyFindarrow_forward

Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

Describe the two major mechanisms that drive the exchange ofmolecules and ions between the capillaries and the interstitial fluid.

Summary Introduction

To review:

The two major mechanisms that drive the exchange of molecules and ions between capillaries and interstitial fluid.

Introduction:

An exchange of ions and molecules occurs between capillaries and interstitial fluid. A certain force or energy is required for the diffusion of materials for its exchange. The smaller particles in the fluid pass through the capillaries directly and the larger ones are facilitated by the carrier proteins.

Explanation

There are two major mechanisms to facilitate the diffusion between capillaries and interstitial fluid and are listed as follows:

a. Diffusion along the concentration gradient: Diffusion occurs through the narrow spaces between the capillary endothelial cells and through their plasma membranes. The gradient molecules diffuse inside and outside the cells as per the concentration. Oxygen and carbon dioxide directly pass through the lipid bilayer of the endothelial cell plasma membranes and some molecules like glucose pass by facilitated diffusion...

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