Define diffusion.

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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Define diffusion.

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Introduction:

Passive transportation of substances occurs along the concentration gradient, and energy (ATP: Adenosine triphosphate) is not required. When a substance is transported and possesses a net charge, then the movement of the substance is influenced by the concentration gradient and membrane potential, the electrical potential that exists across the cell membrane. These two combined forces, called electrochemical gradient, depict the direction in which the charged molecule will be transported across the membrane. Hence, the transportation of ions occurs down its electrochemical gradient. Passive transport can be categorized into two types:

  1. Simple diffusion
  2. Facilitated diffusion
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