Comparing Diffusion, Osmosis and Active Transport Flashcards

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Note: We may include questions that have multiple correct answers. It’s useful to remember specific examples to understand these concepts better.

What is diffusion?

The movement of substances from a region of high concentration to a region of low concentration (down a concentration gradient).

What is osmosis?

The movement of water molecules down a concentration gradient and across a partially permeable membrane.

What is active transport?

The movement of substances from a region of low concentration to a region of high concentration (against a concentration gradient), and it requires energy.

What types of substances are moved by diffusion?

Oxygen, carbon dioxide, nutrients (e.g., glucose) and waste products (e.g., urea).

What substance is moved by osmosis?

Water.

What are two examples of substances moved by active transport?

Glucose moving from the lumen to intestinal cells and mineral ions moving into plant roots.

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