Selectively Permeable Membrane to chooseto pass throughthin outer boundary Gate keeper for friendly folks but not enemies A ? B ?

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Presentation transcript:

Selectively Permeable Membrane to chooseto pass throughthin 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-diffusion passive transport 2- osmosis 3- transport protein active 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. H2O O2 CO2

Passive Transport-no energy needed, just equilibrium. Diffusion & Osmosis

If Passive transport doesn’t use energy then what about Active transport? NaCl2 Calcium Potassium Sodium 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 boundary 2. Osmosis B. Spreading out of particles 3. Membrane C. To choose 4. DiffusionD. Amoeba seeking food 5. Active TransportE. No energy needed 6. Selectively F. To pass through 7. Passive TransportG. Revolving door using energy 8. Transport ProteinH. Water moving across a membrane 9. Engulfing I. Energy needed to scooter uphill