1.2 - Transport Across Cell Membranes Flashcards
What does selectively permeable mean?
The membrane controls the movement of molecules based on size.
What type of transport moves down a concentration gradient?
Passive transport.
What type of transport works against a concentration gradient?
Active transport.
What type of transport is osmosis?
Passive transport.
What is diffusion?
The movement of substances from a high concentration to a low concentration down a concentration gradient.
What is osmosis?
The diffusion of water through a selectively permeable membrane.
Which substances diffuse into animal cells?
Oxygen, glucose, and amino acids.
Which substances diffuse out of animal cells?
Carbon dioxide and urethra.
Why is diffusion important to cells?
It provides the cell with the substances it needs and removes waste products.
What could cause an animal cell to burst?
Being in a solution with a water concentration higher than the inside of the cell.
What would happen to an animal cell is a solution with a lower water concentration than the inside of the cell?
Osmosis would cause the cell to lose water and shrink.
What would happen to a plant cell in a solution with a high water concentration?
It would take in water and become turgid.
What would happen to a plant cell in a solution with a low water concentration?
It would loose water and become plasmolysed.
What has happened to the structure of a plasmolysed plant cell?
The vacuole has shrunk causing the membrane to pull away from the cell wall.
What has happened to the structure of a turgid cell?
The vacuole has swelled pressing the cell membrane against the cell wall.
