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October 22, 2016 Aim: Active transport Hw. Study for the test Wednesday 9/26. Typed lab report due 10/27 Go over handout hw. 1. Collect data lab. Demo lab about plasmolysis. 2. Definition of active transport 3. Forms of active transport 4. Examples 5. Practice Test Difussion is caused by molecules moving, the collision provide the energy Simple diffusion → air, liquids and through phospholypid bilayer Facilitated diffusion → happens through protein channels. Mosaic model of the cell membrane October 22, 2016 Active transport: Movement of particles from an area of low concentration to an area of high concentration. It requires ATP (energy) The process involves protein pumps and vesicles. If the process is towards the inside of the cell is called endocytosis If the process is towards the outside is called exocytosis. A special case of endocytosis is called • phagocytosis (large particles are ingested) http://www.ibiblio.org/virtualcell/textbook/chapter3/cmf1.htm October 22, 2016 To summarize Passive transport includes: Molecules move high to low concentration No ATP. Simple diffusion ( small molecules such as water, oxygen and CO2), liquids, gasses, and through phospholypid membrane Facilitated diffusion: Through protein channels (Sugars, amino acids, and other medium size molecules) Osmosis; the movement of water through a semi permeable membrane. The net movement is affected by the solution surrounding the cell. (Hypertonic or Hypotonic solution) Pump proteins, for example in nerve cells pumping NA+ and K+ to create electric charge inside the cell. Endocytosis ingestion of substances Active Transport Molecules move from low concentration to high Requires ATP Pinocytosis ingestion of "dissolved" molecules (medium size) n a solution i Phagocytosis: Ingestion of large molecules forming vesicles. • Exocytosis Exocytosis Expulsion of molecules October 22, 2016