Active Transport And Osmosis Flashcards Preview

Biology B3 > Active Transport And Osmosis > Flashcards

Flashcards in Active Transport And Osmosis Deck (13):
0

Where are villi located?

In the small intestine

1

How many villi are there in the small intestine?

Millions

2

How are villi specialised to make the absorption of digested food quicker into the blood?

The increase the surface area of the intestines, only have one layer of surface cells and have a very good blood supply

3

What is active transport?

The movement of molecules against a concentration gradient

4

Why does having root hair cells mean plants can absorb more water and mineral ions?

They have a bigger surface area

5

Why do plants use active transport to get mineral ions and water from the soil?

The concentration of mineral ions and water is usually higher in the root hair cell than the soil so only active transport would work

6

What does active transport require to work?

Energy from respiration

7

When is active transport used in humans?

It's used in the gut when there is a low concentration of nutrients in the gut but a high concentration of nutrients in the blood

8

What is osmosis?

The movement of water molecules across a partially permeable membrane from a region of high water concentration to a region of low water concentration

9

What is a partially permeable membrane?

A membrane with very small holes

10

What direction does osmosis happen?

Both ways because molecules move randomly

11

What is the underneath of the leaf?

An exchange surface covered in stomata to let carbon dioxide diffuse through

12

What diffuses out of the stomata?

Oxygen and water vapour