4313509
Description
Flashcards by Ella-mentary, updated more than 1 year ago
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Created by Ella-mentary
over 8 years ago
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| Question | Answer |
| Passive transport | The transport of a molecule across a cell membrane by diffusion. |
| Active transport | A process that moves chemicals across a cell membrane against a concentration gradient, using energy (ATP) |
| Diffusion | The process by which molecules of gas or liquid move from an area of high concentration to an area of lower concentration. |
| Osmosis | Movement of water across a partially permeable membrane from a dilute solution to a more concentrated one, without the use of energy. |
| Facilitated diffusion | Movement of specific molecules across cell membranes through protein channels. |
| Vesicles | Membrane bound compartments in eukaryotic cells. |
| Endocytosis | Cellular uptake of biological molecules via the formation of vesicles from the plasma membrane surrounding the molecule. |
| Exocytosis | A process in which a vesicle inside a cell fuses with the plasma membrane releasing its contents to the external environment. |
| Potassium channel | A carrier protein in membranes which allows potassium to move out of a cell by facilitated diffusion. |
| Osmolarity | A measure of the concentration of solute particles (which cause osmosis) in a given volume of fluid. |
| Hypotonic | A solution whose solute concentration is lower than the solute concentration of another solution. |
| Hypertonic | A solution whose solute concentration is higher than the solute concentration of another solution. |
| Kidney dialysis | A process in which a machine uses osmosis and diffusion to filter urea salts and water from blood, in place of the kidneys. |
| Diffusion gradient | The difference in molecular concentration that allows diffusion to occur. |
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