DIFFUSION AND EQUILIBRIUM

PASSIVE TRANSPORT

Continuous Gradient

HIGH CONCENTRATION

LOW CONCENTRATION

Discontinuous Gradient

HIGH CONCENTRATION

LOW CONCENTRATION

DIFFUSION

EQUILIBRIUM

Continues until EQUILIBRIUM

Channel Proteins

Facilitated Diffusion

• Using a Carrier protein (see e-activities on webpage).

Entering and Exiting the Cell

• http://www.youtube.com/watch?v=HndmASfmI8Y

• Exocytosis EndocytosisExiting the cell Entering the cell

Phagocytosis Pinocytosis

(Food) (liquids)

Active Transport

• go to Go.hrw.com: http://go.hrw.com/resources/go_sc/interactOnline/hx/hxcen2_io.swf

•

Vocabulary

Define:1. concentration gradient2. passive transport3. Diffusion4. Osmosis5. hyptertonic

Passive Transport Active Transport

Comparison of Active and Passive Transport

Both

http://www.youtube.com/watch?v=s0p1ztrbXPY&feature=related passive transport

http://www.youtube.com/watch?v=STzOiRqzzL4&feature=related active transport

http://www.youtube.com/watch?v=awz6lIss3hQ&feature=related Na/K pump

Signal Transduction• Transducer• From Wikipedia, the free encyclopedia:

• A transducer is a device that converts one type of energy to another. The conversion can be to/from electrical, electro-mechanical, electromagnetic, photonic, photovoltaic, or any other form of energy. While the term transducer commonly implies use as a sensor/detector, any device which converts energy can be considered a transducer.

• http://www.youtube.com/watch?v=bU4955rLv_8&feature=related• Signal Transduction

• http://www.youtube.com/watch?v=tMMrTRnFdI4&feature=related• More on signal transduction

Signal Transduction

Receptor

protein

G

Binding site

Signal

Enzyme

ATP

cAMP

Na

OA• An amoeba is swimming in pond water

(which contains some salt, but not as much as the ocean). What happens when the amoeba is put into distilled water? What happens when it is put into ocean water?

Ocean

Pond

DistilledWater

80 80

50 50

0 0

% Na %Cl iso-, hypo- or hyper- tonic

?

?

?