High School

**Chapter 8.3 Questions**

**Passive Transport**

1. Where does every living cell exist?
2. What is one of the most important processes carried out by the cell membrane?
3. What is homeostasis?

**Diffusion**

4. What does the cytoplasm consist of?
5. In what way do particles tend to move?
6. What is diffusion?
7. Diffusion is the driving force behind the movement of many substances across what?
8. What is equilibrium?
9. What is passive transport?

**Facilitated Diffusion**

10. What types of molecules pass through the cell membranes the easiest?
11. Why do some larger molecules seem to pass through the membrane very easily?
12. Protein channels help the diffusion of what across the membrane?
13. What is facilitated diffusion?
14. Does facilitated diffusion require the cell's energy?
15. What is the difference between diffusion and facilitated diffusion?

**Osmosis**

16. The inside of a cell's lipid bilayer is _____.
17. What are the water channel proteins that allow water to pass through the membrane?
18. What is osmosis?
19. In what way do molecules move during osmosis?
20. What is the difference between osmosis and other forms of diffusion?
21. What is isotonic?
22. What is hypertonic?
23. What is hypotonic?
24. The net movement of water into or out of a cell produces a force that is known as _____.
25. How does osmotic pressure affect an animal cell in a hypertonic solution?
26. How does osmotic pressure affect an animal cell in a hypotonic solution?
27. What are most cells in fresh water?
28. How does osmotic pressure affect a plant cell?
29. Why are cells in larger organisms not in danger of bursting?
30. What happens when cells do come in contact with fresh water?
31. Why is osmosis really just a special case of facilitated diffusion?

Answer :

Final answer:

Passive transport, including diffusion and osmosis, facilitates the movement of substances across cell membranes without energy input, crucial for homeostasis. Facilitated diffusion utilizes transport proteins to assist larger or polar molecules that cannot easily cross the lipid bilayer. These processes ensure proper cellular function and balance in varying environments.


Explanation:

Cell Transport Mechanisms

Cells operate within a dynamic environment where multiple transport processes ensure that essential substances can enter or leave. This transport can be classified into various types, including passive transport processes like diffus...ion and osmosis. Let’s take a closer look at some key concepts related to these processes.

1. What is Passive Transport?

Passive transport is the movement of ions and molecules across cell membranes without the need for energy input. This type of transport happens along the concentration gradient (from high to low concentration), allowing cells to maintain homeostasis efficiently.

2. Understanding Diffusion and Osmosis

  1. Diffusion refers to the process where particles spread from areas of high concentration to low concentration until equilibrium is reached.
  2. Osmosis is a specific type of diffusion that involves the movement of water across a semipermeable membrane. Water moves from areas of high water concentration (low solute) to areas of low water concentration (high solute), allowing the cell to achieve balance.

3. Facilitated Diffusion

Facilitated diffusion involves specific proteins that help move larger or polar molecules across the membrane. Unlike simple diffusion, which relies solely on concentration gradients, facilitated diffusion necessitates transport proteins that act as pathways for substances that would otherwise struggle to pass through the lipid bilayer.

4. Osmotic Pressure and Cell Integrity

  1. When an animal cell is in a hypertonic solution, water moves out of the cell, causing it to shrivel due to decreased internal pressure.
  2. In a hypotonic environment, the cell swells as water moves in, which could potentially lead to bursting if the osmotic pressure is excessive.

5. Importance of Transport in Homeostasis

All these mechanisms play a critical role in maintaining homeostasis, enabling cells to regulate their internal conditions despite external fluctuations. Moreover, the structure of the plasma membrane contributes to its selective permeability, ensuring that cells can control what enters and exits efficiently.


Learn more about Cell Transport here:

https://brainly.com/question/43785737


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