Biology Lecture 16 - Biology Lecture 16 3 sodiums are...

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Biology Lecture 16 3 sodiums are pumped out for every 2 potassium ions coming into the membrane in the sodium- potassium pump. Sodium goes from an area of high concentration to an area of low concentration and potassium goes from an area of low concentration to an area of high concentration. Active transports allows cells to maintain chemical and electrical gradients Interior of cells have negative charge and exterior has positive charge Membrane voltage is called membrane potential (-50 to -200 mV) Created by an electrogenic pump (its pumping ions outside the cell) Creates work potential Passive transport Chemical gradient involves moving based on concentration difference Electric gradient involves moving based on voltage difference Membrane acts like a battery: potential for passive flow of cations into the cell and anions out of cell Sodium/Potassium Pump Glycoprotein in all animal cells Functions in nerve impulses, muscle movement, cellular respiration, etc. Secondary Active Transport or Cotransport
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Biology Lecture 16 - Biology Lecture 16 3 sodiums are...

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