Cellular Transport

Essential Question: How does the cell membrane help

regulate homeostasis in cells?

Passive- NOENERGY

CellularTransport

Active- ENERGY

Diffusion FacilitatedDiffusion

Oxygen&CarbonDioxide

Osmosis

HypertonicIsotonicHypotonic

ProteinsandATP

EndocytosisExocytosis

SodiumPotassiumPump

Homeostasis

Ability of living systems to maintain a steady and uniform internal environment to allow

normal function of the systems

Plasma/Cell Membrane • Cell membrane

controls what gets in or out of the cell to regulate homeostasis.

• Semi-permeable• Made of a double

layer of lipids and proteins (phospholipids)

• Inner membrane: Hydrophobic- CANNOT be w/ H2O

• Outer membrane: Hydrophilic- CAN be w/ H2O

Concentration gradient- the difference in the concentration of a substance between two areas

Passive TransportThe movement of ions or molecules across a cell membrane with concentration gradient,

no energy required. HIGH ---> LOW concentration

Passive Transport• Diffusion- ions/molecules moving

across the membrane• Facilitated Diffusion- same as diffusion

but uses protein channels• H2Osmosis- Movement of WATER

across the membrane

H2OSMOSIS- TONICITYHypotonic- movement of water

into a cellIsotonic- Molecules are at the

same concentration and flow in and out equally

Hypertonic-movement of water out of a cell

Tonicity

Active TransportThe movement of ions or molecules across a cell membrane against concentration

gradient, requiring energy (ATP).LOW ---> HIGH concentration

Active TransportATP- Adenosine triphosphate

Energy produced by mitochondria during cellular respiration

Active Transport• Endocytosis- a cell transports

molecules into the cell by engulfing them in the cell using energy.

• Exocytosis- a cell transports molecules out of the cell by engulfing them in the cell using energy.

Passive- NOENERGY

CellularTransport

Active- ENERGY

Diffusion FacilitatedDiffusion

Oxygen&CarbonDioxide

H2Osmosis

HypertonicIsotonicHypotonic

ProteinsandATP

EndocytosisExocytosis

SodiumPotassiumPump

ShrinkBalanceExpand

InOut