Active transport- Biology revision
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8 Terms
what do cells of active transport usually have lots of?
Mitochondria
Definition of active transport
The movement of ions across a cell membrane, from a region of low concentration to their higher concentration gradient, suing energy released in respiration.
what does it cost to move things against the concentration gradient?
energy
what does the energy come out of?
respiration occurring in the mitochondria.
What are transport proteins
use the energy to move nutrients in or out the cell.
What molecules need to be transported against their concentration gradient?
movement of mineral ions into a plants roots
movement of glucose into the blood from the small intestine
why would changes have active transport and why?
A lack of oxygen
an increase in temperature
the presence of poison
why is active transport useful
it allows root hair cells to absorb mineral ions from the soil and cells in the small intestine use active transport to absorb sugar into the blood
Note 
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