transport across cell membrane

What does the cell membrane consist of?

Phospholipids and proteins and is selectively permeable.

Where does passive transport occur?

Down a concentration gradient and does not require energy

Examples of passive transport?

Diffusion and osmosis

Where do diffusion concentration of substances exist?

Between cells and their environment

What is the importance of cell diffusion in cells?

Is the movement of molecules down the concentration gradient

What is diffusion? ( definition)

The movement of molecules down a concentration gradient from a higher to lower concentration.

What is the importance of diffusion to include?

Glucose carbon dioxide and oxygen

Definition of osmosis?

Is the movement of water molecules from a higher water concentration to a lower water concentration through a selectively permeable membrane.

What happens to animal cells when you place them in a solution with a hwc?

Burst

What happens to animal cells when you place them in a solution with a lwc?

Shrivels up

What happens to plant cells when you place them in a solution with a hwc?

Turgid ( expanding )

What happens to plant cells when you place them in a solution with a lwc?

Become plasmolysed ( shrinks )

What is active transport?

Requires energy for membrane proteins to move molecules and ions against concentration gradient