Passive Transport
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Passive Transport. Diffusion : Movement of molecules from an area of high to low concentration Movement continues until equilibrium is reached Equilibrium : molecules spread evenly. Diffusion (contd). Where is the higher CARBON DIOXIDE concentration?.

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  • Diffusion: Movement of molecules from an area of high to low concentration

  • Movement continues until equilibrium is reached

    • Equilibrium: molecules spread evenly


Diffusion contd
Diffusion (contd)

Where is the higher CARBON DIOXIDE concentration?

Where is the higher oxygen concentration?

  • Passive transport: No energy (ATP) required to move molecules

  • Which molecule will enter and which will exit this cell?

    • Oxygen will enter, CO2 will exit


O2

The woman inhales a breath of oxygen

O2

O2

O2


O2

O2

O2

O2

O2

O2

The oxygen spreads into the womans lungs


O2

O2

O2

O2

O2

O2

The oxygen fills the air sacs (alveoli) located in her lungs


Due to diffusion, the oxygen will spread from the area of high to the area of low concentration

Where is the HIGH oxygen concentration?

O2

O2

O2

O2

O2

O2

Where is the LOW oxygen concentration?


The heart pumps this oxygen-rich blood around your body high to the area of low concentration

O2

O2

O2

O2

O2

O2


O2 high to the area of low concentration

O2

O2

O2

O2

O2

Cell X needs oxygen just like all cells. But cell X is not in direct contact with the blood and oxygen. So how does cell X get oxygen?


Where is the high oxygen concentration
Where is the HIGH oxygen concentration? high to the area of low concentration

O2

O2

O2

O2

O2

O2

Cell X (and all other cells) gets oxygen through the process of diffusion!


The reverse process is true w/ carbon dioxide. Over time, CO2 waste builds up in cells. Too much is fatal. It must be removed.

CO2

CO2

CO2

CO2

CO2

CO2

CO2

CO2

CO2


Where is the high carbon dioxide concentration
Where is the HIGH carbon dioxide concentration? CO2 waste builds up in cells. Too much is fatal. It must be removed.

CO2

CO2

CO2

CO2

CO2

CO2

CO2

CO2

CO2

CO2 diffuses from the cells (high concentration) and into the blood stream (low concentration)


The heart pumps the CO2 rich blood back to the lungs. CO2 waste builds up in cells. Too much is fatal. It must be removed.

CO2

CO2

CO2

CO2

CO2

CO2

CO2

CO2

CO2


CO2 CO2 waste builds up in cells. Too much is fatal. It must be removed.

CO2

CO2

CO2


Where is the HIGH carbon dioxide concentration? CO2 waste builds up in cells. Too much is fatal. It must be removed.

CO2 diffuses into the air sacs (alveoli)

CO2

CO2

CO2

CO2


The diaphragm muscle pushes the CO2 out of the lungs CO2 waste builds up in cells. Too much is fatal. It must be removed.

CO2

CO2

CO2

CO2

CO2

CO2

CO2

CO2



Osmosis

Defined every breath!: Diffusion of water from a high to low concentration

High H2O concentration

Less solutes

Ex: Distilled water

Osmosis

Distilled water

Cell


Osmosis1

Defined every breath!: Diffusion of water from a high to low concentration

High H2O concentration

Less solutes

Ex: Distilled water

Low H2O concentration

More solutes

Ex: Salt water

Osmosis

Salt water

Cell



Think pair share
Think, Pair, Share every breath!

A cell has been placed into a mystery solution and appears to have shrunken/shriveled.

  • What can you conclude about the water concentration inside the cells compared to outside?

  • What can you conclude about the solute concentration inside the cells compared to outside?

  • Which type of solution is the cell placed in?

  • Using your explanation of osmosis, explain why the cell appears to have shrunken.


A cell has been placed into a mystery solution and appears to have shrunken.

1) What can you conclude about the water concentration inside the cells compared to outside?

This means there was a greater water concentration inside the cell and it lost water.

2) What can you conclude about the solute concentration inside the cells compared to outside?

Because the water concentration was high (see question 1), there must have been a low amount of solutes inside the cell.

3) Which type of solution is the cell placed in?

hypertonic

4) Using your explanation of osmosis, explain why the cell appears to have shrunken.

The cell shrunk because it lost water. There was a greater water concentration inside the cell so therefore water diffused out of the cell.


Facilitated diffusion

Defined to have shrunken. : Larger molecules enter/exit with the help of protein channels in the plasma membrane

Q: Why are the molecules moving from left to right and not from right to left?

A: Left side has the higher concentration

Facilitated Diffusion


Review
REview to have shrunken.

1) In which direction does diffusion occur?

2) Across which part of the cell does diffusion mostly occur?

3) Which molecule of energy is not required during passive transport?

4) True or False: More solutes creates less concentrated water.

5) Which chemical is involved in osmosis?

6) Examine the picture. If the dots are solutes, where is the high solute concentration?

7) Examine the picture. If the dots are water molecules, where is the low water concentration?

8) Examine the picture. If the dots are water molecules, which way will osmosis occur?

9) Examine the picture. If the dots are solute molecules, which way will osmosis occur?


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