Chapter 8

Chapter 8 - Chapter 8 Membrane Transport Plasma membrane is...

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Chapter 8 Membrane Transport Plasma membrane is selectively permeable Many of the organelles inside the cell also has membrane Movement across membrane 1. Passive—requires no energy-move molecule down concentration grid. High concentration to low concentration. Ex. Diffusion—movement of molecule from high concentration to low concentration. 2. Active transport—requires energy, usually in form of ATP. Can move against the concentration gradient. From low concentration to high concentration. Some molecules are easily moved into membrane by passive transport. (H20, CO2) Ions are very small but, they can’t passively move because, of their high charge, they need to be carried. Passive transport-simple diffusion o Small molecules and non polar (hydrophobic) can go in to PM Types of Passive Transport 1. Simple diffusion 2. Facilitated diffusion 3. Osmosis Tonicity— is the measure of the osmotic pressure of the two solutions that are separated by semi permeable membrane. o Hypertonic —solutes are more concentrated outside the cell, so the water will leave the cell. there is more solution outside of the cell than there is in the inside of
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Chapter 8 - Chapter 8 Membrane Transport Plasma membrane is...

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