Transport Acros Cell Membrane Flashcards
What’s the definition of diffusion?
The net movement of participles from an area of high concentration to and area of low concentration and its a passive process
What’s the definition of osmosis?
Diffusion of water molecules across a partially permeable membrane from an area of higher concentration to and area of lower concentration
What’s the definition of active transport?
The use of energy to move molecules and ions across plasma membranes against a concentration gradient (it involves carrier proteins)
What’s facilitated diffusion?
- A passive process
- Uses carrier and channel proteins
The transport of larger molecules through t carrier proteins or channel proteins in the cell membrane
What are carrier proteins and what do they do?
Move large molecules into/out of cell down their conc gradient
What are the 3 stores of different carrier proteins facilitating the diffusion of different molecules?
1) a large molecules attached to carrier protein in membrane
2) protein then changes shape
3) this releases the molecules on the opposite side of the membrane
What are channel proteins and what do they do?
Form pores in membrane for charge particles to diffuse through (down conc gradient)
Different channel proteins facilitate the diffusion of different charged particles
What’s the process of active transport (its similar to facilitated diffusion)
Molecules attached to carrier protein
Protein changes shape and moves molecule across membrane
This released it to the other side
What’s the difference in active transport compared to others?
Energy is sued - comes from ATP
What’s ATP, how is it made and what does it do?
Produced by respiration
Acts as immediate source of energy in cell
When it’s hydrolysed in cell energy is released and it’s used to move molecules against concentration gradient
What’s endocytosis?
What’s exocytosis?
