topic
Active transport
Active transport moves substances against a concentration gradient using energy released by respiration.
Let’s learn
Core knowledge: Active transport moves substances against a concentration gradient using energy released by respiration.
Contrast active transport with diffusion and osmosis.
See it
Root hair cells absorb mineral ions from dilute soil into a more concentrated cell interior; this movement against the gradient requires energy.
Try it together
Complete a comparison table: substance, direction, membrane, energy and biological example.
Now you try
1. Why is energy required? 2. Give one human example. 3. Predict the effect of low oxygen on active transport.
Check your answers
1. Movement is against the gradient. 2. Glucose absorption in the small intestine. 3. Less respiration means less energy, so rate falls.
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