PHYS 215 Lecture Notes - Lecture 3: Mechanoreceptor, Goldman Equation, Endoplasmic Reticulum
6 Sep 2016
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Document Summary
Lipids are both hydrophobic (water fearing) and hydrophilic (water loving) Phospholipid bilayer hydrophilic head groups and hydrophobic tail groups line up: protein. Think of plasma membrane as a sea of proteins and lipids. Water bipolar, oxygen with a net negative charge and hydrogen with a net positive charge, this is what makes water a good solvent. When a salt dissolves into water it separates into its cation and anion components: e. g. Bilayers are impermeable to ions, so proteins that allow the movement of ions are necessary. Calcium channels are made up of proteins that interact to for a tunnel through the membrane tat allows the transport of calcium. Diffusion the movement of ion down its electrical / chemical gradient: fick"s law of diffusion. Pumps movement of ions against the concentration gradient through the use of atp: carriers. Saturation (once all bound, that"s it no more)
