CELL TRANSPORTMOVING MATERIAL ACROSS THE CELL MEMBRANE

PASSIVE TRANSPORT

• Movement of materials across the cell membrane must be regulated to maintain homeostasis inside the cell.

CELL MEMBRANE- IDENTIFY THE COMPONENTS

BACKGROUND INFO

• Solute- what is dissolved in solution

• Solvent- what does the dissolving- often water

• Solution- solute + solvent

PASSIVE TRANSPORT #1

• Diffusion- Solute particles move from an area of high concentration to low concentration

• Example – food coloring and water

• No use of cellular energy

EXAMPLES ON BOARD

• Use your whiteboards to predict movement of solute.

FACILITATED DIFFUSION- PASSIVE TRANSPORT 2

• Solute molecules pass through protein channels and diffuse faster than expected

• Kind of like a short cut

• Still passive transport- not cellular energy required

PASSIVE TRANSPORT #3

• Osmosis- water moves from low solute concentration to high solute concentration, or the water moves from area of high water concentration to low- still a type of diffusion

• The big idea is that the solvent moves not the solute

• These processes happen to achieve equilibrium or balance

• Aquaporins- channel proteins that allow water to pass

• Osmotic pressure- water pressure due to osmosis

EXAMPLES OF OSMOSIS ON BOARD

• Use your white boards.