Slide 1

Slide 2

Explain the significance of the selectively permeable membrane to the transport of molecules. Predict the movement of molecules across a selectively permeable membrane (diffusion, osmosis, active transport) needed for a cell to maintain homeostasis given concentration gradients and different size molecules. Explain how water is important to cells (body temp., soluble environment, reactant in chemical reaction, maintains turgidity).

Slide 3

Identify that water is important to cells. Explain how water is important to cells. Predict movement of molecules across a selectively permeable membrane needed to maintain homeostasis. Compare and contrast process used in movement of molecules across a semipermeable membrane, taking energy use into consideration.

Slide 4

CCell Membrane flexible barrier of cell that regulates what enters and leaves the cell. TThe cell membrane is semipermeable.

Slide 5

CCell Membrane flexible barrier of cell that regulates what enters and leaves the cell. CCell Wall protects cell and give cell structure. Found only in plant cells.

Slide 6

What does permeable mean? What does semi - permeable mean?

Slide 7

Slide 8

Slide 9

Slide 10

In a solution, particles move constantly. Diffusion tendency of particles to move from an area of high concentration to an area of low concentration.

Slide 11

When do the particles of solute stop moving? When the concentration of solute is the same throughout, and the system has reached equilibrium (homeostasis).

Slide 12

Water diffuses across membranes more easily than other substances. Osmosis diffusion of water across semi- permeable membrane.

Slide 13

Which of the following is an example of diffusion? a. A student sprays perfume and it moves throughout the room. b. Food coloring is added to a beaker of water and slowly spreads during a science experiment. c. Both a and b are examples of diffusion. d. None of the above are examples of diffusion.

Slide 14

During diffusion, particles move from a. Area of high concentration to area of low concentration. b. Area of low concentration to area of high concentration. c. They dont movetheyre just particles. d. Areas where they will explode

Slide 15

How much energy does a cell use for diffusion? Cell uses ________ energy for materials to get into cell for DIFFUSION or OSMOSIS.

Slide 16

Slide 17

WWe have more to go for this section. WWe will begin a lab later in the week. VVocabulary for homework.

Slide 18

Explain the significance of the selectively permeable membrane to the transport of molecules. Predict the movement of molecules across a selectively permeable membrane (diffusion, osmosis, active transport) needed for a cell to maintain homeostasis given concentration gradients and different size molecules. Explain how water is important to cells (body temp., soluble environment, reactant in chemical reaction, maintains turgidity).

Slide 19

Identify that water is important to cells. Explain how water is important to cells. Predict movement of molecules across a selectively permeable membrane needed to maintain homeostasis. Compare and contrast process used in movement of molecules across a semipermeable membrane, taking energy use into consideration.

Slide 20

WWhat is diffusion? WWhy does diffusion occur? WWhat is osmosis?

Slide 21

Find out who is the oldesthypertonic Find out who is in the middlehypotonic Find out who is the youngestisotonic

Slide 22

Three types of solutions: 1) Hypertonic above strength

Slide 23

Three types of solutions: 1) Hypertonic above strength 2) Hypotonic below strength 3) Isotonic same strength

Slide 24

For organisms to survive their cells must balance the intake of water, salts, sugars, and other molecules.

Slide 25

Slide 26

1) What is the difference between diffusion and osmosis? 2) Which type of solution is considered same strength. 3) Which type of solution is considered above strength. 4) Which type of solution is considered below strength.

Slide 27

Dont forget about the vocabulary worksheet from Monday. Chap. 7 Review Pg. 189 1-6 OMIT #5 Pg. 197 20-23 Wednesday/Thursday well do a case study, finish notes (just a little left), and talk about hand washing lab, build cell transport foldable.

Slide 28

Describe the importance of selectively permeable membrane to the transport of molecules. Predict the movement of molecules across a selectively permeable membrane needed for a cell to maintain homeostasis. Explain how water is important to cells.

Slide 29

1) What is the difference between diffusion and osmosis? 2) Which type of solution is considered same strength. 3) Which type of solution is considered above strength. 4) Which type of solution is considered below strength.

Slide 30

What if a cell is placed into a hypertonic solution?

Slide 31

What if a cell is placed into a hypotonic solution?

Slide 32

What if a cell is placed into a isotonic solution?

Slide 33

So why dont our cells burst open shrivel up? Hypertonic Isotonic Hypotonic

Slide 34

Some molecules seem to pass through the cell membrane more easily than they should. Example: RBCs have a glucose (sugar) channel that allows glucose to pass in and out. Only glucose can pass through the channel.

Slide 35

Facilitated Diffusion is the diffusion of particles through protein channels. Hundreds of channels have been found to allow only one specific material through. Carbohydrates and sugars mostly Hyper link

Slide 36

Active transport transport of materials that requires energy. Uses pumps that are found in the membrane. The most common pump is the sodium (Na) potassium (K) (salts) pump.

Slide 37

Uses energy to move molecules from low to high concentration (against concentration gradient). Hyper link

Slide 38

PASSIVE TRANSPORT ACTIVE TRANSPORT 1) Diffusion 2) Osmosis 3) Facilitated Diffusion NO ENERGY REQUIRED!!! 1) Active Transport REQUIRES ENERGY!!!

Slide 39

Review questions: What do we call the diffusion of water? How do large molecules diffuse into a cell when they are too large to pass through the cell membrane? What is the difference between active transport and passive transport? What are three examples of passive transport? Have a good weekend!