Diffusion moves substances in which direction?

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Study for the Galen Anatomy and Physiology (AandP) 1 Theory Exam 2. Gain confidence with flashcards, pinpoint areas needing focus, and strengthen understanding through detailed explanations. Excel in your exam with comprehensive preparation!

Multiple Choice

Diffusion moves substances in which direction?

Explanation:
Diffusion moves substances down their concentration gradient, from areas of higher concentration to areas of lower concentration. This happens because molecules are in constant random motion and tend to distribute themselves evenly over time. It’s a passive process, not requiring external energy, and it proceeds until concentrations on both sides equalize. So it describes movement from high concentration to low concentration. The other statements don’t fit diffusion: diffusion isn’t driven by energy gradients in general, it doesn’t require enzymes, and moving from low to high concentration would go against the gradient rather than along it.

Diffusion moves substances down their concentration gradient, from areas of higher concentration to areas of lower concentration. This happens because molecules are in constant random motion and tend to distribute themselves evenly over time. It’s a passive process, not requiring external energy, and it proceeds until concentrations on both sides equalize.

So it describes movement from high concentration to low concentration. The other statements don’t fit diffusion: diffusion isn’t driven by energy gradients in general, it doesn’t require enzymes, and moving from low to high concentration would go against the gradient rather than along it.

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