Question

1. fill in the blanks. in osmosis water flows from __________ to __________ concentration.
2. in diffusion such as what occurs in the lungs when we breathe in, molecules flow from __________ to ________ concentration. this occurs in the alveoli when oxygen flows from the ________ to the ________ and carbon dioxide flows from the ________ to the __________.
3. what is meant by the term semi - permeable as it relates to the cell membrane?

a. all materials can enter and leave the cell
b. certain things can enter while others cannot
c. the cell manually sorts through all materials

Explanation:

• Osmosis is the movement of water from an area of low solute (high water) concentration to an area of high solute (low water) concentration across a semi - permeable membrane.
• Diffusion is the movement of molecules from an area of high concentration to an area of low concentration. In the alveoli, oxygen diffuses from the alveoli (high concentration) to the blood (low concentration) and carbon dioxide diffuses from the blood (high concentration) to the alveoli (low concentration).
• A semi - permeable membrane (like the cell membrane) allows certain substances (usually small molecules like water, oxygen, carbon dioxide) to pass through while restricting the passage of larger molecules or ions.

Answer:

1. In osmosis water flows from low solute (high water) to high solute (low water) concentration.
2. In diffusion such as what occurs in the lungs when we breathe in, molecules flow from high to low concentration. This occurs in the alveoli when oxygen flows from the alveoli to the blood and carbon dioxide flows from the blood to the alveoli.
3. The term semi - permeable as it relates to the cell membrane means b. Certain things can enter while others cannot