Materials can move in and out of animal cells through one of two reasons: Passive transport or active transport. Passive transport happens naturally and requires no energy on the part of the cell. It usually happens through osmosis, diffusion, or facilitated diffusion. Active transport involves endocytosis, exocytosis, or molecules moving from a low concentration to high concentration. Active transport requires energy.
Both, the cells use it to move materials around the cell
Materials needed by the cells move from the blood into the cells, and waste materials move from the cells into the blood.
Blood moves materials past cells, allowing for diffusion. It also moves cells themselves to places they are needed, as with immune system cells.
They pass through the cell walls and or membranes depending on wether or not its a plant or animal cell. Animal cells have only membranes. Plant cells have both.
Muscle cells move bones which move animals.
fibrous
diffusion
Because they are travlers
muscle cells...
muscle cells...
Some ways in which material may move in and out of cells are diffusion and also osmosis.
For animal cells it is called a "gap junction"