Transportation across cell memberanes Flashcards
What is the cell membrane made of
Phospholipids, proteins
Why are substances Abel to move across the membrane
Because it selectively permeable
What are the concentrations of substance in each side of the membrane
Different
How do molecules move across the cell membrane
Passive and active transport (diffusion and osmosis)
What does passive transport involve
Substances moving down a concentration gradient and does not require energy
What is diffusion
The movement of molecules from an area of higher concentration to an area of higher concentration
What substances move into the cell
Glucose and oxygen
What substances move out of the cell
Carbon dioxide
What does active transport require
Energy for membrane proteins to move molecules and ions against concentration gradient
What is osmosis
Movement of water molecules from a higher water concentration to a lower water concentration through a selectively permeable membrane
What can happens to animal cells as a result of osmosis
Burst or shrink
What can happens to plant cells as a result of osmosis
Can become turgid or plasmolysed
What happens to animal cells if they are placed in a solution with a lower water concentration
They will shrink
What happens to animal cells if they are placed in a solution with a higher water concentration
Burst
What happens to plant cells if they are placed in a solution with a lower water concentration
Plasmolysed
