Cell Processes Review
Diffusion
Diffusion
Diffusion• How does the solute move?
• High to low or low to high
• Needs energy? or no energy
Equilibrium• When concentration is the same
on either side of membrane
• No net movement of solutes
Osmosis• Diffusion of water
• High concentration to low
Osmosis
Normal RBC
What happens to RBC when…
We place them in salt water
We place them in distilled water
Facilitated Diffusion• Movement of specific molecules across
cell membranes through protein channels
HighConcentration
LowConcentration
CellMembrane
Glucosemolecules
Proteinchannel
Active Transport• High to low or low to high
• Needs energy? or no energy?
Molecule tobe carried
Moleculebeing carried
Energy
Carrier proteins• Proteins that act like pumps
Endocytosis• The process of taking material into the cell
by means of infolding of the membrane
Food particle engulfing Forms a vacuole
Phagocytosis
• Cell eating
• White blood cells do this
Specialization
• When cells develop in different ways to perform different tasks
Levels of Organization
Cells Tissues Organs Organ Systems
Biological organization