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Cell Transport

What is passive transport? The diffusion of a substance across a selectively permeable membrane, such as a cell membrane.
What is diffusion? Movement without added energy found in solutions such as living organisms. The the molecules (or ions) of a substance spread out evenly in the space they occupy.
What is concentration? What is a concentration gradient? Concentration refers to the number of molecules of a substance in a given volume. A concentration gradient is an unequal concentration from one region to another
In the absence of other factors, how do molecules diffuse? Down their concentration gradient. High concentration to low concentration.
When does diffusion end? When equilibrium is reached. This becomes a dynamic equilibrium.
What is osmosis? A type of diffusion in which only water moves. In osmosis, water molecules diffuse across a selectively permeable membrane from an area of high concentration of water molecules to an area of low concentration of water molecules.
What is facilitated diffusion? A type of diffusion that allows polar substances like glucose/ions such as sodium and chloride ions to passively move in and out of cells.
What do membrane proteins help with? Facilitated diffusion.
What is active transport? Requires cellular energy for solutes to move across the cellular membrane. It uses ATP to provide energy for this movement.
What does homeostasis require? Cells actively transport molecules in and out of the cell to achieve and maintain this balance. This is to maintain their internal conditions.
What pump is important for animal cells? Sodium-potassium pump. Pumps 3 sodium ions out of the cell and 2 potassium ions into the cell for each cycle of the pump.
What is endocytosis? A form of transport that uses ATP and brings large substances into a cell.
What is exocytosis? This process is used to move substances out of a cell.
What does passive transport include? Diffusion, osmosis, and facilitated diffusion.
Created by: JustEmma
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