Active Transport

Catalyst:

Objectives

By the end of the period, SWBAT… Compare active and passive transport

Identify whether cellular transport is diffusion, active transport, or osmosis

Passive Transport

Key Point #1: Passive transport takes no energy and always moves towards equilibrium. The goal is equal concentrations. High Low concentration Happens easily and naturally (no

energy) BOTH diffusion AND osmosis are

passive transport

In DIFFUSION The solutes are permeable

to the membrane and move H L.

In OSMOSIS Only water is permeable

to the membrane.

Active Transport

Key Point #2: Active transport takes energy to move all solutes in or out of the cell.

The goal is to move against equilibrium Low High Happens on purpose (takes energy)

In ACTIVE TRANSPORT

The solutes are permeable to the membrane and move L H

Active Transport

Why would the cell do this? To store food inside the cell To eliminate wastes To get rid of toxins

Comparing the Three

DIFFUSION

ACTIVE TRANSPORT

PASSIVE TRANSPORT

OSMOSIS

SOLUTES

WATER

EQUILBRIUM

NO ENERGY

SOLUTES

EQUILBRIUM

ENERGY

Helpful Hints

How can you tell if something is active or passive?

How do you know if it diffusion or osmosis?

Ask yourself: Is the solute moving, or is water moving? What is permeable to the membrane? Are we moving H L or L H?

Guided Practice

State whether this is Active Transport or Passive Transport

Active or Passive?

Active or Passive?

Active or Passive?

Water moving to equalize concentrations

Active or Passive?

Cell uses energy to get as much sugar as possible

Active or Passive?

Happens naturally with no use of energy

Active or Passive?

ALL solutes being moved out of the cell

Active or Passive?

Takes energy

Active or Passive?

Moving toward equilibrium

Changing Gears

Now I will give your two cells. I will tell you what is moving and where. You tell me if it is DIFFUSION, OSMOSIS, OR ACTIVE TRANSPORT.

If solutes are moving from L R

If solutes are moving from L R

If water is moving from R L

Water is moving from inside outsideA cell has a 40% sugar

concentration inside is in a solution of 50% sugar concentration

HINT: IT MIGHT HELP YOU TO DRAW THE SITUATION

Solutes are moving from inside outsideA cell has a 10% sugar

concentration inside is in a solution of 50% sugar concentration

Solutes are moving from outside insideA cell has a 10% sugar

concentration inside is in a solution of 80% sugar concentration

Solutes are moving from outside insideA cell has a 40% sugar

concentration inside is in a solution of 20% sugar concentration

Exit Question