That depends on the kind of waste. If a cell is
doing cellular respiration, it is producing carbon
dioxide. CO2 can just diffuse out of
the cell and into the fluid around the cell by
diffusion, moving from an area where there’s a
lot of it to where there is less of it.
Diffusion is a passive process. It happens
because molecules are always moving around
randomly. If they are small enough and not too
polar, they can go right through the cell
membrane. If they are bigger or polar, they can
move through tubes in the cell membrane. That’s
call facilitated diffusion. Salts, sugars,
and some proteins can move this way.
Really big waste can be “spit out” by the membrane
in a process called “exocytosis.” ‘Exo’
means out, and ‘cyto’ means cell. The wastes are
in little bags made of membrane (vesicles). When
the bags hit the cell membrane, they start to
become a part of the membrane. This releases the
wastes to the outside of the cell. The process
uses energy as the cell uses contracting fibers to
change the cell shape and move things.
The cell can also pump out certain wastes using
active transport. Active transport uses
special proteins to throw out the wastes. This
What kinds of wastes might different types of
You may be interested in studying cell biology.
Thanks for asking,