Movement into and out of cells

Diffusion

The net movement of PARTICLES from an area of high concentration to an area of low concentration until equilibrium

Osmosis

The net movement of WATER from a region of higher water concentration to a region of lower water concentration across a semi-permeable membrane

Active transport

The movement of particles from an area of low concentration to an area of high concentration against the concentration gradient using energy released in respiration

What kind of process is diffusion and where does it normally happen?

Passive process

What molecules can pass through a membrane?

Very small molecules such as

The bigger the difference in concentration

the _ the diffusion rate (fill gap)

Only what can pass through a partially-permeable membrane?

Water molecules

When a cell is short of water

the solution inside the cell becomes more . Meaning the solution outside is more

How does the rate of diffusion change if you decrease surface area?

Increase

How does visking tubing show diffusion? (NON-LIVING EXAMPLE)

The visking tubing acts as a semi-permeable membrane which shows what is able to diffuse and not diffuse through

What happens to the cells inside a red onion when placed in strong salt solution? (LIVING EXAMPLE)

Since the salt solution is much more concentrated than the inside of the onion

How does putting a potato strip in a salt solution show osmosis? (LIVING EXAMPLE)

When the potato is placed in a salt solution

How does agar cubes show diffusion rate? (NON-LIVING EXAMPLE)

When agar cubes (alkaline/base) are placed in hydrochloric acid (acid)