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What is active transport?
The movement of particles across a membrane against a concentration gradient (i.e. from an area of lower to an rea of higher concentration) using energy transferred during respiration
How is active transport from diffusion?
The particles move up a concentration gradient rather than down, and the process requires energy (unlike diffusion which is a passive process)
What happens when there’s a higher concentration of nutrients in the gut than in the blood?
The nutrients diffuse naturally
What happens when there’s a lower concentration of nutrients in the gut than in the blood?
Active transport; allows nutrients to be taken into the blood, despite the fact that the concentration gradient is the wrong way (essential to stop us from starving)
