Diffusion Review

Multiple Choice

What is diffusion?

• when molecules move 
• when molecules move from a high concentration to a low.
• no movement 
• molecules move everywhere

Multiple Choice

Where is there a low concentration of dye?

• at the bottom of cup
• in the color
• at the top of cup 
• no concenteraion gradient

Multiple Choice

The picture below is an example of _________________.

• osmosis
• isotonic
• diffusion
• active transport

Multiple Choice

What is DIFFUSION?

Multiple Choice

Permeable means

• things can pass through
• the concentration levels are different
• it is permanent
• things are stuck

Multiple Choice

Cell membranes are said to be selectively permeable. Which statement best explains what selectively

permeable means?

• The cell membrane prevents any harmful substance from entering the cell.

• The cell membrane lets certain substances enter the cell and keeps certain substances out of the cell.

• The cell membrane has pores that let only water and glucose into the cell and carbon dioxide out.

• The cell membrane allows only large molecules to diffuse into the cell.

Why does the body need Oxygen?

Oxygen is used to make ATP, the cell's form of energy, in CELLULAR RESPIRATION

Multiple Choice

Why does the body need Oxygen?

• to stay hydrated

• to make glucose in photosynthesis

• to stay awake in class

• to make ATP energy in cellular respiration

Step 1) RESPIRATORY SYSTEM (O₂)

1. Oxygen is moved to the lungs by inhalation

2. Oxygen moves from the lungs to the bloodstream through the heart by diffusion

Step 2) CIRCULATORY SYSTEM (O₂)

3. Red blood cells carry Oxygen in the blood to body cells in different parts of the body

Multiple Choice

Which of the following is the correct order of O₂ movement?

• heart --> lungs --> mouth --> body cells

• mouth --> heart --> body cells --> lungs

• mouth --> lungs --> heart --> body cells

• lungs --> heart --> body cells --> mouth

Step 3) CELLULAR RESPIRATION

4. Oxygen moves from the bloodstream to the body cell by diffusion

5. Body cells use Oxygen to make ATP in the mitochondria

6. Carbon dioxide is made by the body cell as a waste product of cellular respiration

7. Carbon dioxide moves from the body cell to the bloodstream by diffusion

Step 4) CIRCULATORY SYSTEM (CO₂)

8. Carbon dioxide is carried in the bloodstream back to the heart

9. CO₂ passes from the heart to the lungs by diffusion

Step 4) RESPIRATORY SYSTEM (CO₂)

10. CO₂ leaves the lungs through the trachea to the mouth and nose in a process called exhalation

Multiple Choice

What is a waste product of cellular respiration?

• ATP

• O₂

• CO₂

• Glucose

Multiple Choice

Which two systems work together to bring O₂ into the body and CO₂ out of the body?

• circulatory and digestive

• respiratory and circulatory

• digestive and integumentary

• respiratory and integumentary

Multiple Choice

Where does Oxygen go after it enters the lungs?

• it moves to the mouth through exhalation

• it stays in the lungs

• it moves to the bloodstream through diffusion

• it moves to the body cells through diffusion

Multiple Choice

Without the respiratory system, body cells would not receive Oxygen from the air. How would an organism make energy in the cells?

• cells would make lungs to get O₂ to make ATP

• cells would not change, they can still get O₂ from the bloodstream

• cells would not make energy without O₂

• cells would do anaerobic respiration to make ATP without O₂

Multiple Choice

Where does Oxygen go after it enters the lungs?

• it moves to the mouth through exhalation

• it stays in the lungs

• it moves to the bloodstream through diffusion

• it moves to the body cells through diffusion

Materials diffuse through small blood vessels in the placenta from the mother's blood to the fetus.

​

Exchange of Materials between a mother and her fetus

Multiple Choice

What is the name of the organ that diffuses materials such as oxygen, nutrients, and wastes from the mother's blood to her fetus?

• umbilical cord

• mammary gland

• placenta

• ovary

Multiple Choice

When both inside and outside of a cell have the same amount of water it is said that the cell has reached a state of

• Osmosis
• Diffusion
• Equilibrium

Multiple Choice

Molecules A and B are commonly found in plant cells. When tested, it was discovered that molecule A quickly passed through the artificial plant cell membrane. Molecule B did not pass through.

The locations of molecules A and B at the beginning of the experiment are shown. Which statement best describes what was observed when the setup was examined 20 minutes later?

• Molecule A remained inside the artificial cell and molecule B remained outside.

• Only molecule A was found both inside and outside the artificial cell.

• Only molecule B was found both inside and outside the artificial cell.

• Both molecules A and B were found inside and outside the artificial cell.

Multiple Choice

Which one of the following diagrams indicates the areas where each of these substances would be located

after 20 minutes?

Multiple Choice

After two hours, the color of the liquid in the beaker shown did not change. This shows that

• glucose molecules combined to produce starch in the artificial cell

• glucose moved from the artificial cell into the beaker

• starch did not pass out of the artificial cell

• starch was digested to glucose in the artificial cell

Multiple Choice

The diagram represents one of many microscopic air sacs in a human lung. The alveolus (air sac) is the place where oxygen (O2) and carbon dioxide (CO2) move into or out of the blood, as represented in the diagram. Alveolus CO2 O2 Out In Capillary Which statement best explains why these gases are able to move in the directions shown in the diagram?

• The CO2 moves out of the capillary and into the alveolus to make more room for the blood to carry O2.

• The O2 is needed by the cells, so it is actively transported into the blood. The CO2, which is not needed, is actively transported out of the blood.

• The blood coming to the lungs is low in CO2 and high in O2, so the gases each diffuse from a lower to a higher concentration in this area

• The blood coming to the lungs is high in CO2 and low in O2, so the gases each diffuse from a higher to a lower concentration in this area.

Multiple Choice

Identify the substance/molecule that will not diffuse.

• Starch

• Glucose

• Iodine

Multiple Select

Identify the substance(s)/molecule(s) that will diffuse.

• Starch

• Glucose

• Iodine

Multiple Choice

What is the starch indicator?

• Iodine

• Bromothymol Blue

• Benedict's Solution

• Glucose

Multiple Choice

What color does the starch indicator turn when it comes in contact with starch?

• blue-black

• blue

• orange-red

• yellow