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Definition
| The movement of subtances that can cross the cell membrane without any input of energy by the cell |
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| the movement of molecules from an area of higher concentration to an area of lower concentration. |
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| the difference in concentration of molecules across a space. |
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| 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. |
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| 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 |
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Definition
| when the concentration of solute molecules outside the cell is lower than the concentration of solute molecules inside of the cell |
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| when the concentration of solute molecules outside the cell is higher than the concentration of the solute molecules inside the cell |
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Definition
| when the concentrations of solutes inside and outside of the cell are equal |
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| organelles that remove water |
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| the pressure that water molecules exert against teh cell walls |
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Definition
| when cells shrink away from the cell walls and turgor pressure is lost in a hypertonic environment |
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Definition
| when water diffuses into the cells, causing them to swell and eventually burst in a hypotonic environment |
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Definition
| specific proteins that carry molecules across the cell membrane in facilitated diffusion |
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Definition
| membrane proteins that provide small passageways across the cell membrane through which ions can diffuse |
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Definition
the carrier proteins that help with active transport |
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| one example active transport in animal cells involves this protein |
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Definition
| the process by which cells ingest external fluids, macromoleculs, and large particles, including other cells |
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Definition
| when vesicles in the cytoplasm fuse with the cell membrane, releasing their contents into the cell's external environment |
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Definition
| a membrane-bound organelle |
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Definition
| the transport of solutes or fluids |
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Definition
the movement of large particles or whole cells |
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| 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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