Membrane Transport Flashcards
What is passive transport
High to low concentratiom and without energy
What is diffusion?
- Movement of molecules frim high concentration to low
- Is passive
- small uncharged particles
Facilitated diffusion
- Uses carrier pr to move large molecules
- high concentrationto low
- passive (no energy required)
What is osmosis?
Movement of water, it is passive
What transport protein is used?
Aquaporins
What does aquaporins do?
Move polar subatances across bilayer
What are the terms used to describe the water relationship between a cell and external environment?
Isotonic, hypotonic, hypertonic
What is isotonic?
The solute inside is same as solute outside, amount of h20 entering the cell is the same as leaving
What is hypotonic?
Solute inside is more than the solute outside, h20 moves from environment to cell
Describe Hypertonic
- Solute inside the cell is less then outside
- h20 moves out of cell into environment
Why can life not exist with passive transport alone?
- diffusion is slow
- Passive is only 50/50
- passive is random
- size is limited
What is active transport?
Low to high concentration, requires energy
describe protein pumps
Uses carrier pr-s to move molecules against gradient.
- requires energy
- is an active transport
- atp molecules provide the pr- with energy
Describe endocytosis
Move large molecules, requires energy, move eith or without gradient
What are the 3 types of endocytosis
Pinocytosis, phagocytosis, receptor assisted endocytosis
