Diffusion & Osmosis S7L2. Goals: Define- Diffusion Define- Diffusion Define- Osmosis Define- Osmosis...

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Transcript of Diffusion & Osmosis S7L2. Goals: Define- Diffusion Define- Diffusion Define- Osmosis Define- Osmosis...

Diffusion & OsmosisDiffusion & OsmosisS7L2S7L2

Goals:Goals:

Define- DiffusionDefine- Diffusion Define- OsmosisDefine- Osmosis Define- Semi Permeable MembraneDefine- Semi Permeable Membrane Define- Selectively PermeableDefine- Selectively Permeable Define- HomeostasisDefine- Homeostasis Define- Passive and Active TransportDefine- Passive and Active Transport Define- Endo and ExocytoseDefine- Endo and Exocytose

Predict: what will happen when Predict: what will happen when I spray this I spray this

Define DiffusionDefine Diffusion

The movement of The movement of molecules from a molecules from a area in which they area in which they are highly are highly concentrated to a concentrated to a area in which they area in which they are less are less concentrated. concentrated.

Think of a spill. Does Think of a spill. Does all of the liquid stay all of the liquid stay in one place?in one place?

Draw a diagram of an example Draw a diagram of an example of diffusion we saw in class.of diffusion we saw in class.

3 Minute Walk About, 3 Minute Walk About, Let’s act out diffusion.Let’s act out diffusion.

Define osmosisDefine osmosis

The diffusion of The diffusion of waterwater across a across a selectively permeable selectively permeable membranemembrane. . Water moves from an area of high to Water moves from an area of high to low concentrationlow concentration

What does high concentration What does high concentration mean?mean?

It means an area It means an area with a lot of with a lot of something.something.

Example: Example: sweet Kool-Aid has a sweet Kool-Aid has a

lot of sugar (high lot of sugar (high concentration) and concentration) and water has a low water has a low concentration of concentration of sugar (none)sugar (none)

What happens if I drop What happens if I drop these dry sponges into a these dry sponges into a

sink of water?sink of water?

Water moves from high concentration (bucket) to low (sponge)

Quick write with a Quick write with a partner:partner:

Define osmosis and Define osmosis and diffusion in your own diffusion in your own

word.word.

Why are osmosis & diffusion Why are osmosis & diffusion important?important?

All living things have All living things have certain requirements certain requirements they must satisfy in they must satisfy in order to remain alive. order to remain alive.

These include These include exchanging gases exchanging gases (usually CO2 and (usually CO2 and O2), taking in water, O2), taking in water, minerals, and food, minerals, and food, and eliminating and eliminating wastes. wastes.

Why are osmosis & diffusion Why are osmosis & diffusion important?important?

All living things have certain requirements All living things have certain requirements they must satisfy in order to remain alive – they must satisfy in order to remain alive – maintain maintain homeostasishomeostasis

These include exchanging gases (usually These include exchanging gases (usually CO2 and O2), taking in water, minerals, CO2 and O2), taking in water, minerals, and food, and eliminating wastes. and food, and eliminating wastes.

These tasks happen at the cellular level.These tasks happen at the cellular level. Molecules move through the cell Molecules move through the cell

membrane by diffusionmembrane by diffusion

HomeostasisHomeostasis

Your cells are in a Your cells are in a balancing act. balancing act. Some times it is Some times it is thirsty and some thirsty and some times it has to go. times it has to go. But homeostasis is But homeostasis is when it just is when it just is “balanced”.“balanced”.

Quick Write with a Quick Write with a partner:partner:

Why are osmosis & Why are osmosis & diffusion important?diffusion important?

Selectively permeable Selectively permeable membranemembrane

A membrane that A membrane that allows only certain allows only certain materials to cross materials to cross it it

Materials pass Materials pass through through porespores in in the membranethe membrane

Active Transport=EnergyActive Transport=Energy

Passive Transport=Slips inPassive Transport=Slips in

Define selectively Define selectively permeable permeable membrane membrane

Identify the types of Identify the types of diffusiondiffusion

EndocytosisEndocytosis

Stuff (food, waste, Stuff (food, waste, water) gets inwater) gets in

The cell literally The cell literally acts like a big acts like a big mouth and opens mouth and opens the choo choothe choo choo

ExocytoseExocytose

Stuff has to goStuff has to go ““exits”exits”

This is how it worksThis is how it works

Create a Venn Diagram of Create a Venn Diagram of Diffusion and OsmosisDiffusion and Osmosis