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