Cell BiologyKey Facts

The Three Types of Cell Transport

Part of Cell Transport — GCSE Biology

This key facts covers The Three Types of Cell Transport within Cell Transport for GCSE Biology. Diffusion, osmosis, active transport, factors affecting transport, surface area to volume ratio, and practical investigations It is section 2 of 18 in this topic. Use this key facts to connect the idea to the wider topic before moving on to questions and flashcards.

Topic position

Section 2 of 18

Practice

18 questions

Recall

20 flashcards

📋 The Three Types of Cell Transport

🔄 Diffusion

Definition: Movement of particles from high concentration to low concentration

No energy required (passive)
Down the concentration gradient
Examples: Oxygen into blood, carbon dioxide out of blood

💧 Osmosis

Definition: Movement of water molecules through a partially permeable membrane from a dilute solution to a more concentrated solution

Water moves from high to low water concentration
Through partially permeable membrane only
Examples: Water uptake by roots, kidney function

⚡ Active Transport

Definition: Movement of substances from a lower concentration to a higher concentration, against the concentration gradient, using energy from ATP

Requires ATP energy
From low to high concentration
Examples: Mineral uptake by roots, glucose reabsorption in kidneys

Practice Questions for Cell Transport

Which statement best describes diffusion?

A. The movement of particles from a region of low concentration to high concentration
B. The net movement of particles from a region of high concentration to low concentration
C. The movement of water molecules through a partially permeable membrane
D. The movement of particles using energy from respiration

1 markfoundation

Explain how osmosis causes a plant cell to become plasmolysed when placed in a concentrated sugar solution.

3 marksstandard

Quick Recall Flashcards

Define diffusion

The movement of particles from an area of high concentration to an area of low concentration down a concentration gradient. No energy is required (passive process).

Define osmosis

The movement of water molecules from an area of high water concentration (low solute concentration) to an area of low water concentration (high solute concentration) through a semi-permeable membrane.