Cellular Transport
Every living cell exists in a liquid environment that it needs to survive. The plasma membrane is selectively permeablemeaning only certain chemicals are allowed in and out of cells.
Diffusion-particels tend to move from an area of high
concentration to an area less concentrated
In cells, substances can diffuse across membranes
WITHOUT requiring the use of energy---PASSIVE TRANSPORT
Osmosis- diffusion of water across a selectively permeable
membrane—enables cell membrane to regulate cell’s
internal environment---HOMEOSTASIS!!
*Osmosis affects cells depending on the type of solution they are placed in: ISOTINIC, HYPERTONIC OR HYPOTONIC
Facilitated Diffusion- molecules, that CANNOT diffuse on their own, moves though protein channels in a membrane
Active Transport- transport protein (carrier) requires ENERGY to help moved particles across the membrane against a
force (concentration gradient)
Exocytosis
Large particles are secreted
or expelled from the cell.
vs
Endocytosis
Large particles are
engulfed and enclosed by
the cell membrane. Then
it can move into the cell.