Biology : Cell Transportation

EOY

What are the 3 types of cell transportation

Diffusion, Osmosis, Active Transport

How to particles diffuse

Diffuse from an area of high concentraion to and are of low concentration.

What factors affect diffusion

Size of particles, Temperature, Concentration Gradient, Diffusion distance, Surface to area volume ration.

Do thigns diffuse quicker through large or small organisms

Small organisms, due to shorter diffusion distances and higher surface area to volume ratios.

How does diffusion take place in the gut?

Digested food particles ike amino acids and glucose diffuse from the gut cavity to blood in the villi

How does diffusion take place in the lungs?

Oxygens diffuses from alveoli into the capillaries around the lungs

What is osmosis

It is the movement of water only from a high water potential to a low water potential through a partially permeable membrane.

What are the 3 states of the cells when filling with water

Plasmolyzed. Flaccid. Turgid

What is a plasmolyzed cell

There isn’t any water inside the cell

What is a Flaccid cell

There is a normal amount of water inside the cell

What is a turgid cell

The cell has absorbed allot of water

What is active transport

When a substance is moved from an area of low concentration to an area of high concentration against the concentration gradient

Why do root hair cells need oxygen

So root haiur cells can absorb minerals by active transport so they need oxygen to produce the ATP

Adding too much water to soil will fill all the air spaces in the soil with water.

Suggest why this will prevent root hair cells from absorbing sodium or chloride ions.

(3)

•If the air spaces are filled with water, there is likely to be less or no oxygen

•This means there will be less or no respiration (and therefore less ATP made)

•This means there will less or no active transport