Diffusion, Osmosis & Cell Membrane

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Presentation transcript:

Diffusion, Osmosis & Cell Membrane Section 1.3 Pages 40-52

Cell Size Vary in size 10-100μm

Why don’t we have giant singled celled organisms running around WHAT LIMITS CELL SIZE? Why don’t we have giant singled celled organisms running around

WHAT LIMITS CELL SIZE? All cells need to exchange food, waste, and gases with their surroundings Limiting factor Surface area to volume ratio

SURFACE AREA TO VOLUME RATIo Surface area: area exposed to outside Volume: stuff in the middle What happens to the surface area and volume when a sphere gets larger???

GIANT CELLS DO NOT EXIST WHAT DOES THIS MEAN? It means that as a cell increases in size its surface area to volume ratio decreases So it is harder for things to Enter Exit GIANT CELLS DO NOT EXIST

Largest Single Cell

Animal Cell

Cell Membrane Cell membrane is selectively permeable Allows some things to pass through Prevents other things from entering Also called semi-permeable

Selectively Permeable CELL

Concentration Concentration is the amount of substance in a given space.

Dilute vs Concentrated

Diffusion

does not require energy Diffusion does not require energy allows for the movement of materials across the cell membrane

Diffusion Movement down a concentration gradient From HIGH concentration to LOW CONCENTRATION

Diffusion

Diffusion

Lab Activity on Diffusion Rates

Osmosis A special term that refers to the movement of water only down a concentration gradient

Osmosis Osmosis = Diffusion of water across a selectively permeable or semi-permeable membrane

Osmosis https://youtu.be/IaZ8MtF3C6M

Osmosis

Osmosis

WS 2-2 Cell Membrane Using your Text Book page 40-44 Complete Pages 1 to 3

Three examples of osmosis: 1 Three examples of osmosis: 1. Equal movement of water in and out = ISOTONIC

Three examples of osmosis: 2 Three examples of osmosis: 2. More water moving into cells than out = HYPOTONIC

Three examples of osmosis: 3 Three examples of osmosis: 3. More water moving out of cells than in = HYPERTONIC

Quick Question What should the solution in an IV bag be? Equal amounts of water entering or exiting cells [Isotonic] More water entering cells [Hypotonic] More water leaving cells [Hypertonic]

Equilibrium When the concentration on both sides of the membrane is the same, it is called equilibrium.

WS 2-2 Cell Membrane Using your Text Book page 45 Complete Pages 4 & 5

Egg Lab Activity

Review Passive Movement across cell membrane Osmosis – movement of water Diffusion – movement of everything else

Section Quiz

WS 2-2 Cell Membrane Review Do Pages 6 & 7 to

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