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04. Cell Transport

Cell Transport

TermDefinition
Phospholipid bilayer Forms a boundary between the cell and it's external environment. Made of two layers of lipids with the hydrophobic tails towards the inside.
Homeostasis Maintenance of constant internal conditions in an organism.
Permeable Allows materials to cross the cell membrane.
Semipermeable Allows some, but not all, materials to cross the cell membrane.
Protein Structures that are embedded in the cell membrane. Can be used as pores or pumps to let molecules into and out of the cell.
Active transport Drives molecules across a membrane from a region of lower concentration to a region of higher concentration.
Against concentration gradient The way molecules move during active transport.
Endocytosis The process of taking liquids or fairly large molecules into the cell by engulfing them in a membrane.
Exocytosis The release of substances out of a cell by the fusion of a vesicle with the membrane.
Energy ATP. Needed for active transport.
Pump Used during active transport to allow molecules against a concentration gradient.
Passive transport The movement of molecules across a cell membrane without energy input from the cell.
Diffusion The movement of molecules in a fluid or gas from a region of high concentration to a region of lower concentration.
Osmosis The movement of water from lower concentration of solutes to an area of higher concentration solutes through a membrane.
Isotonic The solution has an equal concentration of dissolved particles as the cell. Water moves across the membrane at the same rate.
Hypertonic Solution has a higher concentration of dissolved particles as the cell so the water flows out of the cell.
Hypotonic Solution has a lower concentration of dissolved particles as the cell so the water flows into the cell.
Facilitated diffusion Diffusion of molecules across a membrane through transport proteins.
With Concentration Gradient The way molecules move during passive transport.
High to low The way molecules move during passive transport.
Solute A substance that dissolves into a solvent.
Solvent The substance that is present in the greater amount that dissolves another substance.
Equilibrium The condition of a system in which competing influences are balanced, resulting in no net change
Homeostasis The maintenance of constant internal conditions in an organism.
Created by: cfhsbiology