Transport across cell membrane Flashcards
What can cross the cell membrane and how fast
small molecules can pass fast
medium can pass slowly
What is the cell membrane made of
phospholipids and proteins
What do the proteins do
Channel Proteins to carry molecules
Receptors for hormones
What can you describe the cell membrane as
Fluid Mosaic Model
What is diffusion
The movement of molecules down a concentration gradient from a high concentration to low concentration down a concentration gradient through a selectively permeable membrane
When does diffusion stop
When concentration is equal but then molecules will continue to move equally in both directions
What is osmosis?
Diffusion of water molecules
What are examples of passive transport
Diffusion and osmosis
Describe a turgid plant cell
Full vacuole and cytoplasm and cell membrane push up against the cell wall
Describe a plasmolysed plant cell
Small vacuole and cytoplasm and the cell membrane pulls away from the cell wall
What is Active transport
When molecules or ions move from a lower concentration to a higher concentration which require energy and also requires transport protein
