Human Biology, 14 Edition

Published by McGraw-Hill Education
ISBN 10: 1-25924-574-8
ISBN 13: 978-1-25924-574-9

Chapter 3 - Section 3.3 - The Plasma Membrane and How Substances Cross It - Check Your Progress: 2

Answer

Diffusion is the process of molecules moving from an area of higher concentration to an area of lower concentration until the molecules are evenly distributed. Osmosis is the movement of water across a semipermeable membrane. Facilitated transport is the movement of molecules from an area of higher concentration to an area of lower concentration (similar to diffusion) with the help of protein carriers. Active transport is the movement of molecules from an area of lower concentration to an area of higher concentration. Like facilitated transport, this process uses protein carriers.

Work Step by Step

Diffusion is the process of molecules moving randomly from an area of higher concentration to an area of lower concentration until the molecules are evenly distributed. Osmosis is the movement of water across a semipermeable membrane. Facilitated transport is the movement of molecules from an area of higher concentration to an area of lower concentration (similar to diffusion) with the help of protein carriers. Active transport is the movement of molecules from an area of lower concentration to an area of higher concentration. Like facilitated transport, this process uses protein carriers.
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