Simple Diffusion Relative to the concentration gradient movement is doWn the concentration gradient ONLY (higher concentration to lower concentration) (outside) lipid- soluble molecules Rate of diffusion depends on O2, CO2, H2O The concentration gradient Charge on the molecule Size Lipid solubility 0888 (inside)
Simple Diffusion Relative to the concentration gradient movement is DOWN the concentration gradient ONLY (higher concentration to lower concentration) Rate of diffusion depends on • The concentration gradient • Charge on the molecule • Size • Lipid solubility
Simple diffusion &t gap junctions [High [LoW Ca++
Simple diffusion & gap junctions
Facilitated diffusion Carrier-mediated Protein Solute molecules transporte Uniport Symport Anti port
Facilitated Diffusion ▫ Carrier-mediated
Simple diffusion Facilitated diffusion Characteristics of carrier-mediated diffusion net movement always depends on Concentration of S outside cel the concentration gradient Specificity Saturation When S1 is alone Competition In presence of $2 Concentration outside cel
Characteristics of carrier-mediated diffusion net movement always depends on the concentration gradient ▫Specificity ▫Saturation ▫Competition
Channel-mediated Copyrighte The McGraw a Componies, Inc, Permission required tor reproduction cr os round for re 3 3 cartoon models of Copyright e The McGraw-Hill Companies, Inc. Permission required for reproduction or display on channel integral membrane proteins that function as ion channels: the regulated opening and closing of these channels is Cross section the basis of how neurons function queous pore of ion channel
– Channel-mediated 3 cartoon models of integral membrane proteins that function as ion channels; the regulated opening and closing of these channels is the basis of how neurons function