In and Out of CellsIn and Out of Cells

The cell membrane is like The cell membrane is like a plastic bag with tiny a plastic bag with tiny openings.openings.

Materials such as water, Materials such as water, oxygen, and glucose oxygen, and glucose

(sugar), pass through the (sugar), pass through the cell membrane.cell membrane.

One way that materials move One way that materials move through the membrane is called through the membrane is called

DIFFUSION. DIFFUSION.

Particles move from areas of Particles move from areas of HIGH concentration to LOW HIGH concentration to LOW

concentrationconcentration

Osmosis Osmosis (diffusion of (diffusion of waterwater))

Movement of WATER molecules Movement of WATER molecules from high concentration to low from high concentration to low concentrationconcentration

Compare / ContrastCompare / Contrast

Larger particles need to go Larger particles need to go through a membrane protein through a membrane protein

“doorway.”“doorway.”

Passive TransportPassive Transport (needs no (needs no

energy)energy)

Glucose molecules

Active TransportActive Transport (needs energy)(needs energy)

Requires Requires energy energy because it because it movesmovesfrom low to from low to high high concentratioconcentration. n.

EnEndocytosis: docytosis: Moving aMoving a large particle large particle intointo the cell the cell

Vesicle from Golgi Body

Exocytosis Exocytosis Moving a Moving a large particle OUT of the cell large particle OUT of the cell

(EXITS)(EXITS)