Selectively Permeable Membrane to chooseto pass throughthin outer boundary Gate keeper for friendly...

Selectively Permeable Membrane to choose to pass through thin outer boundary

Gate keeper for friendly folks but not enemies

A ?

B ?

Membrane is permeable to:

H2O

O2

CO2

Membrane is NOT permeable to:

NaCl2

Macromolecules (potassium,Calcium, sodium)

Then how do these important substances move in and out of the cell membrane?

They move in & out of the membrane by one of these ways:

1-diffusionpassive transport

2- osmosis

3- transport proteinactive transport

4- engulfing

What is Diffusion?Molecules tend to move from an area of higher

concentration to an area of lower concentration.

How do these paramecium get the oxygen they need to survive from the water around them?

More oxygen in water than inside their cell so it diffuses from high to low concentration.

What is OSMOSIS?-diffusion of water molecules through a selectively permeable membrane

Diffusion and Osmosis are considered Passive Transport.

H2OO2CO2

Passive Transport-no energy needed, just equilibrium.

Diffusion & Osmosis

If Passive transport doesn’t use energy then what about Active transport?

NaCl2CalciumPotassiumSodium

Bigger molecules need energy to get in

Transport protein

What do you think this cool Active transport is called?

ENGULFING !!!

Match these:1. Permeable A. Thin outer boundary2. Osmosis B. Spreading out of particles3. Membrane C. To choose4. Diffusion D. Amoeba seeking food5. Active Transport E. No energy needed6. Selectively F. To pass through7. Passive Transport G. Revolving door using

energy8. Transport Protein H. Water moving across a

membrane9. Engulfing I. Energy needed to scooter

uphill