Topic 2 cell transport Flashcards
What is diffusion
When substances move from an area of high concentration to an area of low concentration through a semi permeable membrane
What does semi permeable mean?
It allows small molecules through but stops big molecules
What is osmosis
When water moves from an area of high concentration to an area of low concentration through a semi permeable membrane
Which processes move down a concentration gradient?
Diffusion and osmosis
Which gas diffuses in and which has diffuses out of a cell?
Oxygen diffuses in
Carbon dioxide diffuses out
Which process moves against a concentration gradient?
Active transport
What are the differences between active transport and diffusion?
Active transport needs energy and is the movement from low to high concentrations
What part of the cell is semi permeable
The cell membrane
What is visking tubing?
Plastic tubing with small holes which mimics the cell membrane. It only allows the small molecules to pass through.
