passive transport. simple diffusion and facilitated diffusion through a specific or non specific transporter. .

simple diffusion design pattern passive transport lipid layer facilitated specific transporter active molecules movement cell membrane concentration gradients atp vector transport active passive cell facilitated diffusion ion membrane osmosis substance atp transfer biology vector chemical filtration movement structure anatomy atomic biological cellular chemistry compared cytoplasm education educational electrochemical energy entropy simple graphic infographic labeled lipid metabolism model molecule phospholipid potassium process protein scheme science transportation