Active and passive transport

Topics: Diffusion, Chemistry, Protein Pages: 2 (624 words) Published: October 20, 2014

Active and passive transport are biological processes that move oxygen, water and nutrients into cells and remove waste products. Active transport requires chemical energy because it is the movement of biochemicals from areas of lower concentration to areas of higher concentration. On the other hand, passive trasport moves biochemicals from areas of high concentration to areas of low concentration; so it does not require energy. Comparison chart

Active Transport Passive Transport
Definition Active Transport uses ATP to pump molecules AGAINST/UP the concentration gradient. Transport occurs from a low concentration of solute to high concentration of solute. Requires cellular energy. Movement of molecules DOWN the concentration gradient. It goes from high to low concentration, in order to maintain equilibrium in the cells. Does not require cellular energy. Types of Transport Endocytosis, cell membrane/sodium-potassium pump & exocytosisDiffusion, facilitated diffusion, and osmosis. Types of Particles Transported proteins, ions, large cells, complex sugars. Anything soluble (meaning able to dissolve) in lipids, small monosaccharides, water, oxygen, carbon dioxide, sex hormones, etc. Examples phagocytosis, pinocytosis, sodium/potassium pump, secretion of a substance into the bloodstream (process is opposite of phagocytosis & pinocytosis) diffusion, osmosis, and facilitated diffusion. Importance In eukaryotic cells, amino acids, sugars and lipids need to enter the cell by protein pumps, which require active transport.These items either cannot diffuse or diffuse too slowly for survival. It maintains equilibrium in the cell. Wastes (carbon dioxide, water, etc.) diffuse out and are excreted; nutrients and oxygen diffuse in to be used by the cell. Functions Transports molecules through the cell membrane against the concentration gradient so more of the substance is inside the cell (i.e. a nutrient) or outside the cell (i.e. a waste) than normal. Disrupts...


References: http://biology.kenyon.edu/HHMI/Biol113/passive_vs_active.htmhttp://en.wikipedia.org/wiki/Passive_transporthttp://en.wikipedia.org/wiki/Active_transporthttp://www.college-cram.com/study/biology/cell-membranes/passive-transport/
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