Chapter 3 FINAL Part B - Movement Through the Plasma Membrane Chapter 3 Part B Cells Tissues General Outline Cell Theory Basic structure of all cells

Chapter 3 FINAL Part B - Movement Through the Plasma...

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Movement Through the Plasma Membrane Chapter 3 Part B
General Outline Cells & Tissues: Cell Theory. Basic structure of all cells Phospholipid Bilayer: Fluid Mosaic Model. Components of Cell Membrane. Cell Movement and Transport: Cell Movement: Cilia vs. Flagella. Transmembrane Transport. Movement Through the Plasma Membrane Cell Organelles Cell Cycle Body tissues: Epithelial Tissue Connective Tissue Muscle Tissue Nervous Tissue Wound Healing
Movement Through the Plasma Membrane There are two ways in which substances can enter or leave a cell: 1) Passive 2) Active
Membrane Transport 1) Passive: Osmosis. Simple diffusion. Facilitated Diffusion: Carrier Proteins: Uniports vs. Symports vs. Antiports Channels: Voltage Gated. Ligand Gated. 2) Active: Active Transport: Primary Active Transport: Secondary Active Transport: Exocytosis. Endocytosis: Phagocytosis. Pinocytosis.
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Passive Transport-> Simple Diffusion: Diffusion is the net passive movement of particles (atoms, ions or molecules) from a region in which they are in higher concentration to regions of lower concentration. It continues until the concentration of substances is uniform throughout.
Diffusion Down Concentration Gradient
Passive Transport-> Simple Diffusion Def: Diffusion is the movement of a substance from an area of higher solute concentration to one of lower solute concentration (down a concentration gradient). a. The concentration gradient is the difference between concentrations in a space. i.e. The difference in the concentrations of the molecules in the two areas is called the concentration gradient . b. The end result of diffusion is uniform distribution of molecules. The end result of diffusion is an equal concentration, or equilibrium , of molecules on both sides of the membrane. At equilibrium , there is no longer an area of high concentration or low concentration, and molecules flow equally in both directions across the semipermeable membrane. At equilibrium, equal amounts of a molecule are entering and leaving a cell. c. Diffusion requires no expenditure of energy. Molecules flowing down a concentration gradient is a natural process and does not require energy .

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