Westside High School 9th Grade Biology

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Presentation transcript:

Westside High School 9th Grade Biology Crossing the Plasma Membrane

Questions What is the job of the plasma membrane? What is semi-permeable? What is the difference between active transport and passive transport? What is osmosis? What will happen to a cell when placed in a hypertonic solution? Hypotonic solution? What are examples of each type of transport?

It controls what goes into and out of the cell The plasma membrane maintains homeostasis for the cell It is selectively permeable: It controls what goes into and out of the cell

Plasma Membrane Structure Two key components of the membrane: Phospholipids – form the membrane Proteins – act as “gates”

Two forms of transport across the membrane: Active Transport ENERGY used Examples: Endocytosis Exocytosis Passive Transport No energy needed Examples: Diffusion Osmosis

Two forms of transport: Passive Transport Diffusion Osmosis * Does not use energy Active Transport Endocytosis Exocytosis * Uses energy

Active transport Endocytosis Figure 3.8

Active transport Exocytosis Figure 3.8

Active Transport Endocytosis Exocytosis Pino- Phago- Exocytosis Ion pumps: Thru a protein, but using energy Figure 3.9

Active Transport: Energy Used? Examples?

Passive Transport: Diffusion Small, uncharged particles are able to pass right between the phospholipids This is called simple diffusion

Passive Transport: Diffusion There are also proteins embedded between the phospholipids. These proteins function as gates, allowing larger or charged molecules to get in/out of the cell Only molecules which are “recognized” are allowed thru these proteins This is facilitated diffusion

Passive transport: Diffusion Concentration gradient: Higher Concentration Lower Concentration Molecules collide – pass thru membrane

Osmosis is the movement of water Water moves TOWARDS the molecules Think of it as “water wants to dissolve stuff”

Passive Transport: Osmosis HYPERtonic ISOtonic HYPOtonic Which way will water move in each case?

Passive Transport: Osmosis HYPERtonic ISOtonic HYPOtonic

What do plant cells have outside of the cell membrane that animal cells do not have? What difference will this make with osmosis?

Effect of osmosis on plant cells Flaccid - Turgid due to plasmolysis - cell shrinks from cell wall

Passive transport: osmosis Which way will water move?

Passive Transport Energy? Examples?

Hypertonic or Hypotonic?

Crossing the Plasma Membrane Passive Transport Active Transport

Crossing the Plasma Membrane Passive Transport No energy needed Diffusion Osmosis Active Transport ENERGY used Endocytosis Exocytosis

Post test What is the job of the plasma membrane? What is semi-permeable? What is the difference between active transport and passive transport? What is osmosis? What will happen to a cell when placed in a hypertonic solution? Hypotonic solution? What are examples of each type of transport?