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Cellular Transport

Cellular Transport. Passive Transport ( No Energy Required ) 1. Diffusion 2. Osmosis 3. Facilitated Diffusion Active Transport (Energy Required ) 1. Sodium Potassium Pump 2. Endocytosis 3. Exocytosis.

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Cellular Transport

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  1. Cellular Transport • Passive Transport (No Energy Required) 1. Diffusion 2. Osmosis 3. Facilitated Diffusion • Active Transport (Energy Required) 1. Sodium Potassium Pump 2. Endocytosis 3. Exocytosis

  2. Diffusion:The spontaneous movement of molecules or particles in solution from areas of higher concentration to a lower concentration - until there is an equilibrium. • Osmosis:The diffusion of (movement of) water molecules through a selectively permeable membrane (such as a cell membrane) from a region of lower solute concentration to a region of higher solute concentration

  3. Facilitated Diffusion • Facilitate = to assist, or to make easier • So, if DIFFUSION is ‘facilitated’ then it must be ‘assisted’. Protein macromolecules found within the cell membrane assist in this process. (Transport and Carrier)

  4. The NaKATPase Pump & Cell Potential • Cell Potential: In Cells that are electrically "at rest,“ (or typical) the cytosol possesses a uniform electric potential – measured in volts. • To maintain ‘healthy’ cell potential, cells need to keep a low concentration of sodium ions (Na+), and high levels of potassium ions (K+) inside the cell. Outside the cell, high concentrations of sodium and low concentrations of potassium are needed.

  5. The NaKATPase Pump & Cell Potential . . . continued • NaKATPase is an Enzyme found in the cell membrane of human cells. The NaKATPase Pump occurs as the enzyme works Actively to keep a higher level of Potassium ions inside the cell and maintain the cell’s proper voltage.

  6. Endocytosis The cell engulfs or ‘swallows’ necessary molecular material This material may be encased in a piece of the cell’s membrane and moved to a location where it will be needed in order to aid in the completion of a cellular process.

  7. Exocytosis • A Secretion process • The cell is discarding what is either unnecessary or harmful to its homeostasis • The opposite of Endocytosis

  8. Tuesday’s Review The use of _________ is the key difference in processes that involve active and passive transport. Cell potential refers to the concept that all of your bodies cells have an ________ ________. (Hint: Voltage) ____________ assists natural diffusion in facilitated diffusion. 4. The NakATPase Pump works to maintain the cell’s homeostasis by keeping a ______________ concentration of K (potassium) inside the cell than outside of it. 5. What is the main difference between Exocytosis and Endocytosis?

  9. “The human being has been endowed with a greater gift than any other living organism on the planet – the ability to reflect and reason.” - Albert Einstein Do not throw away the gift of your mind. Believe in it . . . believe in yourself.

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