ch3 study guide.docx - Aquapourins Carrierproteins...

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Aquapourins membrane channels that allows water to diffuse through the plasma membrane Carrier proteins solute pumps that transport substances in and out the cell Channel proteins membrane proteins that selectively transport ions or water into cell Cytoplasm fluid matrix that suspends organelles Diffusion movement of molecules from an area of higher concentration to lower concentration/  down or with the concentration gradient Exocytosis vesicular transport out of cell Extracellular fluid substances found outside cells  ex. interstitial fluid, blood plasma, cerebral fluid Endocytosis vesicular transport into cell ex. Phagocytosis, pinocytosis, receptor-mediated endocytosis Gated channels An ion channel in a cell membrane that opens or closes in response to a stimulus Hypertonic • Cells lose water by osmosis and shrink in a hypertonic solution  • contains a higher concentration of solutes than are present inside the cells Hypotonic Cells take on water by osmosis until they become bloated and burst (lyse) (contains a  lower concentration of solutes than are present inside cells). Integral proteins • Membrane proteins that are firmly inserted into membrane • Function as transport proteins (channels and carriers), enzymes, or receptors Intracellular fluid the fluids within cells Isotonic • cells retain their normal size and shape in isotonic solutions 
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