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Active and Passive Transport
Chapter 5.1-5.2
22
Biology
10th Grade
12/14/2008

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Term
Passive Transport
Definition
The movement of subtances that can cross the cell membrane without any input of energy by the cell
Term
Diffusion
Definition
the movement of molecules from an area of higher concentration to an area of lower concentration.
Term
Concentration Gradient
Definition
the difference in concentration of molecules across a space.
Term
Equilibrium
Definition
when the concentration of the molecules of a substance is the same throughout the space. This is caused by diffusion, and molecules still move randomly at this state.
Term
Osmosis
Definition
the PROCESS of diffusion by which water molecules diffuse across a cell membrane from an area of higher concentration to an area of lower concentration
Term
Hypotonic
Definition
when the concentration of solute molecules outside the cell is lower than the concentration of solute molecules inside of the cell
Term
Hypertonic
Definition
when the concentration of solute molecules outside the cell is higher than the concentration of the solute molecules inside the cell
Term
Isotonic
Definition
when the concentrations of solutes inside and outside of the cell are equal
Term
Contractile Vacuoles
Definition
organelles that remove water
Term
Turgor Pressure
Definition
the pressure that water molecules exert against teh cell walls
Term
Plasmolysis
Definition
when cells shrink away from the cell walls and turgor pressure is lost in a hypertonic environment
Term
Cytolysis
Definition
when water diffuses into the cells, causing them to swell and eventually burst in a hypotonic environment
Term
Carrier Proteins
Definition
specific proteins that carry molecules across the cell membrane in facilitated diffusion
Term
Ion Channels
Definition
membrane proteins that provide small passageways across the cell membrane through which ions can diffuse
Term
Cell Membrane Pumps
Definition

the carrier proteins that help with active transport

Term
sodium-potassium pump
Definition
one example active transport in animal cells involves this protein
Term
Endocytosis
Definition
the process by which cells ingest external fluids, macromoleculs, and large particles, including other cells
Term
Exocytosis
Definition
when vesicles in the cytoplasm fuse with the cell membrane, releasing their contents into the cell's external environment
Term
Vesicle
Definition
a membrane-bound organelle
Term
Pinocytosis
Definition
the transport of solutes or fluids
Term
Phagocytosis
Definition

the movement of large particles or whole cells

Term
Phagocytes
Definition
cells that use phagoycytosis to ingest bacteria and viruses that invade the body. they allow lysosomes to fuse with teh vesicles that contain the ingested bacteria and viruses
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