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Membrane Transport

What are the 5 ways of transport across a membrane? Diffusion, Osmosis, Active Transport, Exocytosis and Endocytosis
What is Diffusion? The net movement of molecules or ions from regions of high concentration to low concentrations
When will diffusion stop? When an Equilibrium is reached
Does Diffusion use ATP? NO it is a passive movement
What are some of the molecules that can easily be diffused across the cell membrane? Oxygen and Carbon Dioxide
What is facilitated diffusion? When larger hydrophilic molecules and ions are move through proteins, across the phospholipid bilayer.
What proteins are involved in facilitated diffusion? Channel proteins and Carrier Proteins
What is the role of Channel proteins in facilitated diffusion? Channel proteins have a specific shape that allows a specific molecule through.
What is the role of Carrier proteins in facilitated diffusion? Carrier proteins have a specific site, that allows molecules to bind on to them. They they change shape and allows the molecule or ion to pass across the membrane.
Why is diffusion passive? Because no ATP or metabolic energy is needed for the transport.
What is osmosis? The net movement of water molecules from a high concentration to a low concentration of water molecules.
When will osmosis stop? When an Equilibrium is reached.
Is energy needed for osmosis to take place? NO
What is the membrane called that osmosis takes place over? Partially- permeable membrane
What is Active Transport? The movement of molecules across the cell membrane, against the concentration gradient (From low to high)
Why is energy needed in Active Transport? Because substances need to be moved against the concentration gradient.
What proteins are involved in Active Transport? Carrier Proteins
How are carrier proteins used in Active Transport? Substances bind to the carrier proteins, and energy from ATP changes the shape of the protein, causing the substance to be released inside of the membrane
What is Endocytosis? The movement of large particles across the cell surface membrane into the cell
What is Exocytosis? The movement of large particles across the cell surface membrane out of the cell
Created by: stu036791