1. Transport of Solutes across the Plasma Membrane

2. Bellwork
Speculate how an ion, a charged atom, passes through the plasma membrane through the hydrophobic core.

3. Objectives Distinguish between passive transport and active transport
Distinguish between diffusion, facilitated diffusion, and active transport
Distinguish between endocytosis and exocytosis

4. Key Terminology Diffusion Facilitated diffusion Active transport
Exocytosis
Endocytosis
Phagocytosis
Pinocytosis

5. Passive Transport Requires no input of energy
Moves from high concentration to low concentration
Two types
Diffusion
Facilitated Diffusion

6. Diffusion Movement down a concentration gradient from high to low
Occurs without a transport protein

7. Example of Diffusion

8. Facilitated Diffusion
Movement down a concentration gradient; High Low
Requires a transport protein
Transport protein makes the passage across the membrane easier for the solute
The transport protein transports solutes that cannot cross the membrane on their own. Ex. Ions, polar molecules (sugars, amino acids)

9. Example of Facilitated Diffusion

10. PROPERTY OF PIMA COUNTY JTED, 2010
Think-Pair-Share
What is the major difference between diffusion and facilitated diffusion?
3. Think-pair-share
teacher presents a question
teacher gives wait time for student to form answer
teacher instructs students to share their answer with a partner
teacher calls on non-volunteers to share with the class
PROPERTY OF PIMA COUNTY JTED, 2010 3

11. Active Transport Requires an input of energy
Movement against a concentration gradient; LowHigh
Utilizes a transport protein
This protein concentrates small molecules and ions either inside or outside the cell depending on the transport protein
Many cells pump calcium, potassium, and sodium ions cross the membrane against a concentration gradient

12. Example of Active Transport

13. PROPERTY OF PIMA COUNTY JTED, 2010
Think-Pair-Share
Create a Venn diagram comparing facilitated diffusion and active transport
3. Think-pair-share
teacher presents a question
teacher gives wait time for student to form answer
teacher instructs students to share their answer with a partner
teacher calls on non-volunteers to share with the class
PROPERTY OF PIMA COUNTY JTED, 2010 3

14. Summary of Transport Mechanisms

15. Transport of Macromolecules
Exocytosis-transport of macromolecules out of the cell
Macromolecules transported to eliminate waste from cell
Vesicles merge with the cell membrane and release their contents

16. Endocytosis Transport of macromolecules into the cell Two types:
Phagocytosis – movement of particulate matter in the cell
CROSS OUT EXTRA BULLETS HERE

17. Endocytosis-two types
Pinocytosis
taking up extracellular fluid into the cell
Works just like phagocytosis but takes up liquid
rather than particles

18. Summary of Transport Types
Passive Transport
Simple diffusion
Facilitate diffusion
Active Transport
Transport of Macromolecules
Exocytosis
Endocytosis
Phagocytosis
Pinocytosis

19. PROPERTY OF PIMA COUNTY JTED, 2010
Explain
On the Summary of Transport Types:
Describe what distinguishes
each type
6. Paraphrase
student writes down one or two main ideas directly from the text or notes
student now paraphrases these ideas in their own words
teacher provides feedback
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PROPERTY OF PIMA COUNTY JTED, 2010