Membrane Structure Overview

To act as barriers controlling the exchange of materials between the internal and external environment.

Lipids, proteins, and small amounts of carbohydrates.

A phospholipid molecule consists of a glycerol backbone attached to a negatively charged phosphate molecule and two non-polar fatty acid chains.

<p>The hydrophobic interior of the lipid bilayer allows non-polar molecules to pass through easily.</p> Signup and view all the answers

<p>The spontaneous movement of molecules down a concentration gradient from an area of higher concentration to an area of lower concentration.</p> Signup and view all the answers

<p>The diffusion of oxygen from the oxygen-rich air in the alveoli to the blood in the capillaries surrounding the alveoli.</p> Signup and view all the answers