Presentation is loading. Please wait.

Presentation is loading. Please wait.

3.4 Diffusion and Osmosis Somewhere on pg. 28

Published byVictoria Stafford Modified over 8 years ago

Similar presentations

Presentation on theme: "3.4 Diffusion and Osmosis Somewhere on pg. 28"— Presentation transcript:

1 3.4 Diffusion and Osmosis Somewhere on pg. 28 If the cell membrane was rigid (solid or hard), as opposed to fluid (oil or liquid like), explain why the membrane would no longer be selectively permeable.

2 The phospholipids would be unable to move to allow material in or out!
3.4 Diffusion and Osmosis If the membrane was rigid: The phospholipids would not be able to move from side to side or slide past one another The phospholipids would be unable to move to allow material in or out!

3 3.4 Diffusion Sponge: Set up Cornell Notes on pg. 31 Topic: 3.4 Diffusion Essential Question: Explain what a concentration gradient is and what it means for a molecule to diffuse down its concentration gradient. 2.1 Atoms, Ions, and Molecules Explain what a concentration gradient is and what it means for a molecule to diffuse down its concentration gradient. Key Concept: Materials move across membranes because of concentration differences.

4 3.4 Diffusion and Osmosis Standard 1.a Students know cells are enclosed within a semipermeable membranes that regulate their interaction with their surroundings.

5 3.4 Diffusion and Osmosis KEY CONCEPT Materials move across membranes because of concentration differences.

6 3.4 Diffusion and Osmosis Solution: A homogenous mixture of two or more substances, which may be solids, liquids, or gases, or the combination of these. Ex: Sugar water Solute: Substance dissolved in another substance Ex: Sugar Solvent: Substance doing the dissolving (usually the substance present in the greatest amount) Ex: Water (THE BEST SOLVENT)

7 Which one is the Solute? Solvent? Solution?
Milk Chocolate Milk Chocolate Syrup Solution Solvent Solute Air Nitrogen (78%) Oxygen, argon, CO2 (22%) Solution Solvent Solute

8 3.4 Diffusion and Osmosis Passive transport- the movement of molecules across a cell membrane without energy input from the cell There are two types of passive transport. 1. diffusion 2. osmosis

9 Diffusion Demonstration
Materials: 2 Cups, Water, Dye, Salt, Graph Identify the solvent, solute, and solution for each demonstration Hypothesize what is going to happen when you drop the food coloring in the water. Salt in the water? Did your hypothesis match the results? Explain how these experiments demonstrated diffusion

10 Pg. 30 Colored H2O Salt Water Solvent Solute Solution
Colored H2O Salt Water Solvent Solute Solution Hypothesis: What is going to happen when…. Dye is added Salt is added What happened after 5 mins? Was your hypothesis right? How did these experiments demonstrate diffusion? Pg. 30

11 3.4 Diffusion and Osmosis Diffusion: is the movement of molecules in a fluid or gas from a region of higher concentration to a region of lower concentration.

12 3.4 Diffusion and Osmosis Diffusion: is the movement of molecules in a fluid or gas from a region of higher concentration to a region of lower concentration.

13 3.4 Diffusion and Osmosis Diffusion: is the movement of molecules in a fluid or gas from a region of higher concentration to a region of lower concentration.

14 Air Freshener Demo.

15 Concentration gradient- the difference in the concentration of a substance from one location to another. Molecules diffuse down their concentration gradient Top ¼ pg. 30

16 3.4 Osmosis Sponge: Set up Cornell Notes on pg. 33 Topic: 3.4 Osmosis Essential Question: A cell is bathed in fluid. However, you notice that water is flowing out of the cell. In what kind of solution is this cell immersed? 2.1 Atoms, Ions, and Molecules A cell is bathed in fluid. However, you notice that water is flowing out of the cell. In what kind of solution is this cell immersed?

17 Isotonic Solution Hypertonic Solution Hypotonic Solution Pg. 32

18 3.4 Diffusion and Osmosis Osmosis is the diffusion of water molecules across a semipermeable membrane.

19 The water will continue to move across the membrane until it reaches “equilibrium” or an isotonic state

20 Same amount of solutes/water inside and outside cell
3.4 Diffusion and Osmosis There are three types of solutions. Same amount of solutes/water inside and outside cell = amounts of water enter and leave the cell Stays the same size!

21 More solutes outside the cell than inside the cell
3.4 Diffusion and Osmosis There are three types of solutions. More solutes outside the cell than inside the cell More water inside the cell than outside the cell More water exits cell Shrinks!

22 More solutes inside the cell than outside the cell
3.4 Diffusion and Osmosis There are three types of solutions. More solutes inside the cell than outside the cell More water outside cell than inside the cell More water enters cell Expands!

23 Osmosis Computer Graphics Osmosis Demo Video Osmosis with a U-tube
Osmosis Videos Osmosis vs. Diffusion Osmosis Computer Graphics Osmosis Demo Video Osmosis with a U-tube

24 Table 1: Predictions and Conclusions
Gummi Bear Osmosis Lab Table 1: Predictions and Conclusions Starting Information Weight (g) Length (mm) Width (mm) Predictions Conclusion Sugar Water Distilled Water Salt Water .

25 Ruler (mm) String (for width) Salt
Osmosis Lab Materials Materials: 1 cup Water Sugar 1 Gummi Bear Scale (g) Ruler (mm) String (for width) Salt Label each cup: First/Last Name Period #

26 Day One: Gathering Data
Weigh your Gummi Bear and record its weight (g) Measure your Gummi’s length and width (mm) Place the Gummi in a 25/75 sugar/water solution Fill in your table with your hypothesis

27 Day Two: Gathering Data
Dry your Gummi bear off carefully Weigh your Gummi Bear and record its weight (g) Measure your Gummi’s length and width (mm) Was your hypothesis correct? What happened to your Gummi? Compare this data with your group data, and record on Lab report tables. Rinse out your cup and rinse off your gummi (quick and carefully) Place the Gummi in a 100% distilled water Fill in your table with your new hypothesis

28 Day Three: Gathering Data
Dry your Gummi bear off carefully Weigh your Gummi Bear and record its weight (g) Measure your Gummi’s length and width (mm) Was your hypothesis correct? What happened to your Gummi? Compare this data with your group data, and record on Lab report tables. Rinse out your cup and rinse off your gummi (quick and carefully) Place the Gummi in a 25/75 solution of salt and water Fill in your table with your new hypothesis

29 3.4 Diffusion and Osmosis Some molecules cannot easily diffuse across the cell membrane Ex: H2O Facilitated diffusion is diffusion through transport proteins Things like H2O would be repelled by the phospholipid tails, so transport proteins allow the H2O to diffuse easily

30 Pg. 32 Diffusion and Osmosis Video Notes
Osmosis in the kitchen Osmosis with an Egg Desalination- Reverse Osmosis

Download ppt "3.4 Diffusion and Osmosis Somewhere on pg. 28"

Similar presentations

3.4 Diffusion and Osmosis Somewhere on pg. 30 or 31

3.4 Diffusion and Osmosis Somewhere on pg. 30 or 31
Unit 6 Cell Transport Part 1.

Unit 6 Cell Transport Part 1.
Cellular Transport: The movement of materials across the cell membrane.

Cellular Transport: The movement of materials across the cell membrane.
Why is this traffic across the membrane so important?

Why is this traffic across the membrane so important?
Passive Transport: Diffusion and Osmosis

Passive Transport: Diffusion and Osmosis
Moving Cellular Materials SOL BIO 4.d. Fluid Mosaic Model: A mosaic is a structure made up of many different parts. The plasma membrane of a cell is composed.

Moving Cellular Materials SOL BIO 4.d. Fluid Mosaic Model: A mosaic is a structure made up of many different parts. The plasma membrane of a cell is composed.
The purpose of a cell membrane is to separate the environments inside and outside of the cell and to regulate what comes in and out. Cell Membrane.

The purpose of a cell membrane is to separate the environments inside and outside of the cell and to regulate what comes in and out. Cell Membrane.
Diffusion Particles in a solution move from an area of more concentration to an area of less concentration. Particles must be small to cross the cell.

Diffusion Particles in a solution move from an area of more concentration to an area of less concentration. Particles must be small to cross the cell.
Starter Why can you smell the manure when it is being spread in fields miles away? Why can you smell perfume when a girl sprays it on herself from all.

Starter Why can you smell the manure when it is being spread in fields miles away? Why can you smell perfume when a girl sprays it on herself from all.
Osmosis and Diffusion Passive TransportPassive Transport Please pause to answer all questions asked during this video.Please pause to answer all questions.

Osmosis and Diffusion Passive TransportPassive Transport Please pause to answer all questions asked during this video.Please pause to answer all questions.
CH 5 - P. 99-104 HOMEOSTASIS AND CELL TRANSPORT. OBJECTIVES 1. Explain how an equilibrium is established as a result of diffusion. 2. Distinguish between.

CH 5 - P HOMEOSTASIS AND CELL TRANSPORT. OBJECTIVES 1. Explain how an equilibrium is established as a result of diffusion. 2. Distinguish between.
Chapter 4. Transport Across the Cell Membrane  Substances need to move into and out of the cell in order to maintain homeostasis  They can do this by.

Chapter 4. Transport Across the Cell Membrane  Substances need to move into and out of the cell in order to maintain homeostasis  They can do this by.
PASSIVE TRANSPORT Movement of molecules across a membrane that requires no energy and always occurs down a concentration gradient Types of passive transport.

PASSIVE TRANSPORT Movement of molecules across a membrane that requires no energy and always occurs down a concentration gradient Types of passive transport.
Types of Transport Review. The movement of particles against the direction of diffusion requiring cell energy. ACTIVE TRANSPORT.

Types of Transport Review. The movement of particles against the direction of diffusion requiring cell energy. ACTIVE TRANSPORT.
3.3 Cell Membrane Sponge: Set up Cornell Notes on pg. 29 Topic: 3.4 Diffusion Essential Question: Explain what a concentration gradient is and what it.

3.3 Cell Membrane Sponge: Set up Cornell Notes on pg. 29 Topic: 3.4 Diffusion Essential Question: Explain what a concentration gradient is and what it.
Chapter 3 Part 2 Study guide. Question # 1 Think about the Carrot Lab. Draw a quick picture about how the water moved while the carrot was in the salt.

Chapter 3 Part 2 Study guide. Question # 1 Think about the Carrot Lab. Draw a quick picture about how the water moved while the carrot was in the salt.
Warm up The cell membrane is called phospholipid bilayer. – What is a phospholipid? – Which part of the phospholipid is hydrophobic? – Which part of the.

Warm up The cell membrane is called phospholipid bilayer. – What is a phospholipid? – Which part of the phospholipid is hydrophobic? – Which part of the.
Homeostasis: Movement Across the Cell Membrane Students know cells are enclosed within semipermeable membranes that regulate their interaction with their.

Homeostasis: Movement Across the Cell Membrane Students know cells are enclosed within semipermeable membranes that regulate their interaction with their.
TRANSPORT THROUGH CELL MEMBRANES Diffusion and Osmosis.

TRANSPORT THROUGH CELL MEMBRANES Diffusion and Osmosis.
Chapter 2 Lesson 3 Moving Cellular Materials. Cell Membrane The cell membrane is selectively permeable ◦ It allows certain things into the cell while.

Chapter 2 Lesson 3 Moving Cellular Materials. Cell Membrane The cell membrane is selectively permeable ◦ It allows certain things into the cell while.

Similar presentations

Ads by Google