Discuss Cellular Transport

Two types of transport move materials across the Plasma Membrane: Passive & Active Transport.

An examples of Passive Transport are: Diffusion, Osmosis, & Facilitated Diffusion.

Diffusion is the movement of substances with the concentration gradient.

Osmosis & Facilitated Diffusion are kinds of Diffusion.

Osmosis is the movement of water through a semipermeable membrane. Water moves from high to low concentration, that is towards the area where there is more solute, so that means, less water. Less water is: Hypotonic Solution, & more solute is: Hypertonic Solution. If the semipermeable membrane separates the hypotonic from the hypertonic solution, the water will move across the membrane from the hypotonic to the hypertonic solution. NO metabolic enenrgy is involved.

Facilitated Diffusion is the diffusion of a substance across a membrane. It is called "Facilitated" because a transport protein in the membrane enhances the transport of the substance across the membrane.

Active transport uses energy(in the form of ATP), and the materials flow against the concentration gradient. Carrier-mediated active transport systems use energy & membrane proteins to "pump" certain substances against the concentration gradient.