https://pbslm-contrib.s3.amazonaws.com/WGBH/conv19/tdc02-int-membraneweb/index.html Type of Molecule Oxygen Type of Transport - What Structure does it pass through Passes directly through the membrane: passive diffusion Lower concentration in the cell than outside, meaning goes from the outside into less concentrated space inside the cell - Through the lipid Bilayer Carbon Dioxide - Passive diffusion Higher Concentration inside cell than without, meaning it goes to a less concentrated area on outside the cell - Through the lipid Bilayer Glucose - Passive Facilitated diffusion When glucose binds to enzymes in the cell, the concentration outside stays higher, meaning the glucose continues to enter Move in and out to whichever side has a lower concentration - GLUT transporter, which is a carrier protein. Once glucose is in the cell, it binds to an enzyme, which cannot be transported with the GLUT, leaving the glucose stuck inside Passive Facilitated Diffusion Move in and out through channels to whichever side has a lower concentration Will also be carried across the membrane via a pump (active transport). The goal of the cell is to maintain a concentration gradient (low outside the cell and high inside) - Passive Facilitated Diffusion Move in and out through channels to whichever side has a lower concentration Will also be carried across the membrane via a pump (active transport). The goal of the cell is to maintain a concentration gradient (low inside the cell and high outside) - Passive diffusion or Facilitated - - Potassium - - Sodium - - Water - - - - Ion channel specified to the potassium Sodium/ potassium pump In channels specified to sodium Sodium/ potassium pumps Either the lipid Diffusion Enzymes - Exocytosis and endocytosis - These require energy, making them active bilayer or through aquaporins - Travel in vesicles across the bilayer
