passive vs active cell transport. .

active atp bilayer biochemistry biological biology budding carbohydrates carrier cell cellular channel chemical chemistry cytoplasm didactic diffusion education electrochemical energy extracellular facilitated filtration fluid hydrophilic hydrophobic illustration ion lipid mechanism membrane metabolism molecule organism osmose osmosis passive peptide phospholipid plasma potassium process protein receptor reproduction science sea simple sodium sponge substance transfer transmembrane transport transportation vector water