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Active & Passive Transport

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Elisabeth Sterchi

on 23 September 2013

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Transcript of Active & Passive Transport

Active & Passive Transport
Elisabeth Sterchi
Active Transport
The movement of substances across the plasma membrane against a concentration gradient which requires energy
5 types- exocytosis, endocytosis, pinocytosis, receptor-mediated endocytosis, & phagcytosis
Passive Transport
The movement of substances across the plasma membrane which requires no extra energy
Three types- diffusion, osmosis, and facilitated diffusion
Movement of substance from a higher concentration to a lower concentration
Requires no extra energy
Membrane is permeable so substances travel down concentration gradient
Concentration, temperature, and pressure affect rate of diffusion
Dynamic equilibrium- movement but no overall change
Ex.- tea bag, match, food coloring in water
Diffusion of water across a semi-permeable membrane
Isotonic solution-same concentration of water inside & outside of cell
Hypertonic solution- more water inside cell than outside
Hypotonic solution- more water outside cell than inside
Concentration Gradient
Difference between the highest and lowest concentration of a solute
Facilitated Diffusion
Uses transport proteins to move substances
Membrane is impermeable
Requires no additional energy
Na-K Pump
Uses carrier proteins
Enzyme that catalyzes the breakdown of an energy-storing molecule
3 Na ions exit cell, 2 K ions enter
Higher level of Na outside cell which creates concentration gradient
Process where the cell surrounds a substance and encloses it in a part of the plasma membrane
Movement of substances out of the cell by fusion of vesicles with the plasma membrane
"Cell drinking"
Water & solvents are enclosed in a vesicle, used in digestive tract
Receptor-Mediated Endocytosis
More specific with receptor capturing ligand and concentrating into a pit
"Cell eating"
How the human immune system ingests whole bacteria or one-celled creatures eat: pseudopodia
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