Simple Diffusion单纯扩散 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 ° Temperature (inside)Simple Diffusion 单纯扩散 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 • Temperature