1. Chapter 5 Homeostasis and Cell Transport
SPI’s:
1.7 Predict the movement of water and other molecules across selectively permeable membranes.
1.8 Compare and contrast active and passive transport.
Conceptual Strand: All living things are made of cells that perform functions necessary for life.

2. Bellringer # 1
Ridding the cell of material by discharging it from sacs at the cell surface is called
Pinocytosis.
Phagocytosis.
Exocytosis.
Endocytosis.
Clear desk except test scantron and highlighter. Turn in any makeup work.

3. Only through a lipid bilayer membrane.
Bellringer # 2
Diffusion takes place
Only through a lipid bilayer membrane.
From an area of low concentration to an area of high concentration.
Only in liquids.
From an area of high concentration to an area of low concentration.
Set up notes for 5.1. Open text to pg 97.

4. Chapter 5 Table of Contents Section 1 Passive Transport
Homeostasis and Cell Transport
Table of Contents
Section 1 Passive Transport
Section 2 Active Transport

5. Section 1 Passive Transport
Chapter 5
Objectives
Explain how an equilibrium is established as a result of diffusion.
Distinguish between diffusion and osmosis.
Explain how substances cross the cell membrane through facilitated diffusion.
Explain how ion channels assist the diffusion of ions across the cell membrane.

6. Section 1 Passive Transport
Chapter 5
Passive transport involves movement of molecules across cell membrane without an input of energy by the cell.

7. 1. Diffusion: movement of molecules from an area of higher concentration to an area of lower concentration, driven by the molecules’ kinetic energy until equilibrium is reached.

8. Concentration Gradient
Section 1 Passive Transport
Chapter 5
Concentration Gradient
Click below to watch the Visual Concept.
Visual Concept

9. Diffusion Across Membranes
Section 1 Passive Transport
Chapter 5
Diffusion, continued
Diffusion Across Membranes
Molecules can diffuse across a cell membrane by dissolving in the phospholipid bilayer or by passing through pores in the membrane.

10. Section 1 Passive Transport
Chapter 5
Diffusion

11. diffusion of water across a membrane.
Section 1 Passive Transport
Chapter 5
2. Osmosis
diffusion of water across a membrane.

12. Chapter 5 Osmosis Section 1 Passive Transport
Click below to watch the Visual Concept.
Visual Concept

13. Section 1 Passive Transport
Chapter 5
Osmosis, continued
Direction of Osmosis
When solute concentration outside cell is lower than that in cytosol, the solution outside is hypotonic to the cytosol, and water will diffuse into of the cell.

14. Section 1 Passive Transport
Chapter 5
Osmosis, continued
When solute concentration outside cell is higher than that in cytosol, the solution outside is hypertonic to the cytosol, and water will diffuse out of the cell.

15. Section 1 Passive Transport
Chapter 5
Osmosis, continued
When solute concentrations outside and inside cell are equal, solution outside is isotonic, and there will be no net movement of water.

16. Hypertonic, Hypotonic, Isotonic Solutions
Section 1 Passive Transport
Chapter 5
Hypertonic, Hypotonic, Isotonic Solutions

17. Comparing Hypertonic, Isotonic, and Hypotonic Conditions
Section 1 Passive Transport
Chapter 5
Comparing Hypertonic, Isotonic, and Hypotonic Conditions
Click below to watch the Visual Concept.
Visual Concept

18. How Cells Deal With Osmosis
Section 1 Passive Transport
Chapter 5
Osmosis, continued
How Cells Deal With Osmosis
To remain alive, cells must compensate for the water that enters the cell in hypotonic environments and leaves the cell in hypertonic environments.
To help with this cells can contain solute pumps, cell walls, or Contractile vacuoles: regulate water levels in paramecia.

19. The process by which water passes into or out of a cell is called
Bellringer # 3
The process by which water passes into or out of a cell is called
Solubility.
Osmosis.
Selective transport.
Endocytosis.
Get out notes from 5.1. Open text to pg 101.

20. Red blood cells in humans lose their shape when they are not exposed to an isotonic environment and may shrivel or burst: cytolysis.

21. 3. Facilitated Diffusion
Used for molecules like glucose that cannot readily diffuse through the cell membranes.
Does not require additional energy.
Assisted by specific proteins in the membrane called carrier proteins.

22. Facilitated Diffusion cont.
Section 1 Passive Transport
Chapter 5
Facilitated Diffusion cont.
A molecule binds to a carrier protein on one side of the cell membrane and causes it to change shape.
It transports the molecule down its concentration gradient to the other side of the membrane.

23. Facilitated Diffusion
Section 1 Passive Transport
Chapter 5
Facilitated Diffusion

24. Diffusion Through Ion Channels
Section 1 Passive Transport
Chapter 5
Diffusion Through Ion Channels
Ion channels: proteins that provide passageways across the cell membrane through which specific ions can diffuse.
Some stay open, other have gates that open in response to certain chemicals or electrical chemicals.

25. Section 1 Passive Transport
Chapter 5
Ion Channels

26. Concentration gradient Equilibrium Osmosis
5.1 Vocab
Passive transport
Diffusion
Concentration gradient
Equilibrium
Osmosis
6. Contractile vacuole 7. Turgor pressure 8. Facilitated diffusion 9. Carrier protein 10. Ion channel

27. Which of the following is not characteristic of facilitated diffusion?
Bellringer # 4
Which of the following is not characteristic of facilitated diffusion?
It requires a carrier protein.
It moves substances against a concentration gradient.
It required no energy input.
It involves a change in the shape of its carrier.
Open text to pg 103. Set up notes for 5.2

28. Section 2 Active Transport
Chapter 5
Objectives
Distinguish between passive transport and active transport.
Explain how the sodium-potassium pump operates.
Compare endocytosis and exocytosis.

29. requires cells to expend energy.
Section 2 Active Transport
Chapter 5
Active Transport
Active transport moves molecules across membrane from lower concentration to high concentration, or up the concentration gradient.
requires cells to expend energy.

30. Sodium-Potassium Pump
Section 2 Active Transport
Chapter 5
Cell Membrane Pumps, continued
Sodium-Potassium Pump
moves 3 Na+ ions out for every 2 K+ ions it moves into cytosol.
Energy is supplied by ATP.

31. Sodium-Potassium Pump
Section 2 Active Transport
Chapter 5
Sodium-Potassium Pump

32. Section 2 Active Transport
Chapter 5
Movement in Vesicles
Endocytosis
Cells ingest external materials by folding around them and forming a pouch which pinches off and becomes a vesicle.

33. Pinocytosis: contains solutes or fluids,
Section 2 Active Transport
Chapter 5
Movement in Vesicles, continued
Pinocytosis: contains solutes or fluids,
phagocytosis the vesicle contains large particles or cells.

34. Chapter 5 Endocytosis Section 2 Active Transport
Click below to watch the Visual Concept.
Visual Concept

35. Section 2 Active Transport
Chapter 5
Movement in Vesicles, continued
Exocytosis
vesicles made by the cell fuse with the cell membrane, releasing their contents into the external environment.

36. Chapter 5 Exocytosis Section 2 Active Transport
Click below to watch the Visual Concept.
Visual Concept

37. Endocytosis and Exocytosis
Section 2 Active Transport
Chapter 5
Endocytosis and Exocytosis

38. 5.2 Vocab
Active transport
Sodium potassium pump
Endocytosis
Vesicle
Pinocytosis
6. Phagocytosis 7. Exocytosis 8. Cell membrane pump 9. Ion 10. Ionic bonding

39. Channels utilizing facilitated diffusion Work in two directions
Bellringer # 5
Channels utilizing facilitated diffusion
Work in two directions
Require electrical signals to function
Both a and b
None on the above
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41. Bellringer # 6
Which of the following is true of ions and their transport across cell membranes?
The gates for ion channels are always open
Ion channels always allow any type of ion to pass through them.
Electrical or chemical signals may control the movement of ions across cell membranes.
Because they are charged particles, the movement of ions across cell membranes requires energy input.

42. The sodium-potassium pump usually pumps Potassium out of the cell.
Bellringer # 7
The sodium-potassium pump usually pumps
Potassium out of the cell.
Sodium into the cell.
Potassium into the cell.
Only a potassium and sugar molecule together.
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