HyeRi- week1note

HyeRi- week1note - HyeRi Kim([email protected] OH Friday...

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HyeRi Kim ([email protected]) OH: Friday 1-2:50p Stein room 128 Week 1 I. 3 TYPES OF DIFFUSION a. Simple Diffusion i. Diffuse directly across the phospholipids bilayer of cell ii. Lipid-soluble molecules pass 1. Examples a. _________________________________________ iii. Ficks Law of Diffusion 1. Flux = (ΔC x Area x Diffusion Coefficient)/thickness a. ΔC=concentration gradient b. More area=more molecules able to permeate c. D = lipid solubility/ (molecular weight^(1/2) x viscosity) b. Facilitated Diffusion i. Passive transport via transport proteins ii. Channels: Channel Type What’s unique about it? Example Leak Aquaporins for osmosis K + leak channel ligand-gated Neurotransmitters Ach with Na + channel voltage-gated Voltage-gated-K + channels and Na+ channels for action potentials temperature-gated Heat receptor mechanically- gated Knee Jerk Stretch reflex c. Active Diffusion i. Particles moving across membrane against concentration gradient ii. Primary-uses ATP 1. Most important type:
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This note was uploaded on 03/10/2011 for the course BIPN 100 taught by Professor French during the Winter '07 term at UCSD.

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HyeRi- week1note - HyeRi Kim([email protected] OH Friday...

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