GCSE Biology (AQA)

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Active Transport in the Gut

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Cell Biology Transport in Cells

Active Transport in the Gut

1:21 Active Transport
Spec 4.1.3.3
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  • Cells require some substances in large quantities, making diffusion insufficient.
  • Glucose, essential for cell respiration, is an example of such a substance.
  • Active transport is crucial for glucose absorption in the small intestine.
  • The inner space of the intestine is called the lumen, with projections known as villi that are close to the blood supply.
  • Post a sugary meal, glucose concentration might be higher in the lumen than in intestinal cells and blood, allowing diffusion down the concentration gradient.
  • At times, glucose concentration in the lumen is lower than in cells, necessitating movement against the concentration gradient via active transport.
  • Active transport, unlike diffusion and osmosis, requires energy, as it moves substances against the concentration gradient.
  • Understanding the mechanism of sugar absorption by active transport in the gut is important for exams.

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