Active transport

Question 1

What is active transport?

Answer 1

When substances move from areas of low to high concentration.
They go against concentraion gradient.

Question 2

Why is active transport useful?

Answer 2

Allows cells to move sugars and ions through cell membrane.

Question 3

What is needed for active transport to take place?

Answer 3

LOTS of mitochondria ─ Needs lots of energy (produced through respiration) to carry molecule across membrane.

Question 4

What are two examples of active transport being used?

Answer 4

Animal cells ─ move sugars from gut/kidney tubules (sometimes lower con) into the blood. (sometimes higher con)
Why? Because it is needed for cell respiration.
─ special salt glands: remove excess salt from body (low concentration) to estuaries/seas (high concentration)

Plant cells ─ root hair cells move mineral ions in soil (dilute solution) into the plant (concentrated solution)