well oxygen isn't a transport system it is something that can be diffused across the membranes of cells.
Passive
They move via passive transport. They move by diffusion. It's only active transport if A) the cell is too big or not fatty enough to move through the membrane and needs help or B) is making the molecules move unnaturally (low to high). Osmosis is also passive transport, but only is used when referring to the movement of water.
by active and passive transport via cell membrane proteins
passive
Passive transport & follow me on Twitter at BruhMann_
Passive transport is a process in cells where substances move across the cell membrane without requiring energy input. An example of passive transport is the movement of oxygen and carbon dioxide across the cell membrane through simple diffusion.
Carrier proteins can be involved in passive transport.
Two examples of passive transport are simple diffusion, where molecules move across a membrane from an area of high concentration to low concentration, and facilitated diffusion, where molecules move across a membrane with the help of specific transport proteins.
Active transport requires energy while passive transport does not.
Active transport requires energy; passive transport does not.
Active transport requires energy; passive transport does not.
Active transport requires energy, passive transport does not.