transport in cells

bio

Q: What is diffusion?

A: The movement of particles from a high to low concentration, down the concentration gradient, without energy.

Give an example of diffusion in the body.

Oxygen entering blood cells from the alveoli in the lungs.

Name three factors that affect the rate of diffusion.

Temperature, concentration gradient, and surface area.

What is osmosis?

A: The movement of water molecules through a semipermeable membrane from an area of low solute concentration to an area of high solute concentration, without energy.

What happens to a plant cell in pure water?

The plant cell swells and becomes turgid as water enters through osmosis, but it does not burst due to the rigid cell wall.

What happens to an animal cell in a concentrated solution?

The animal cell shrinks and becomes crenated as water exits the cell through osmosis.

What is active transport?

The process of moving molecules across a cell membrane from a region of lower concentration to a region of higher concentration, using energy in the form of ATP.