Six facts about transfers
Transfers of materials into and out of cells is controlled by the cell membrane.
Some materials pass through by diffusion.
Some materials are pumped against a concentration gradient by active transport.
Large materials can pass in or out by endocytosis and exocytosis.
Cells adapted to transferring materials have special features such as microvilli and large numbers of mitochondria.
The surface area to volume ratio of organisms is linked to their ability to transfer substances.
