Active Transport Movement of molecules up the concentration gradient.Movement of molecules up the concentration gradient. Requires energy Requires energy.

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Presentation transcript:

Active Transport Movement of molecules up the concentration gradient.Movement of molecules up the concentration gradient. Requires energy Requires energy Carrier proteins can also serve as “pumps” during active transport.Carrier proteins can also serve as “pumps” during active transport.

The membrane proteins are very specific. One protein that moves glucose will not move calcium.The membrane proteins are very specific. One protein that moves glucose will not move calcium. Sodium Potassium Pump – works to maintain a higher concentration of sodium (Na) ions inside the cell and a higher concentration of postassium (K) ions outside the cell.Sodium Potassium Pump – works to maintain a higher concentration of sodium (Na) ions inside the cell and a higher concentration of postassium (K) ions outside the cell. Requires energy to do so.Requires energy to do so. Creates and electrical gradient across the cell membrane which is essential for nerve impulses.Creates and electrical gradient across the cell membrane which is essential for nerve impulses.

ExocytosisExocytosis EndocytosisEndocytosis PinocytosisPinocytosis PhagocytosisPhagocytosis

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