Name _______________________________
Date Due ____________________________
The Cell Membrane
Introduction: The cell membrane (also called the plasma membrane) is the site of many physiological events
such as immune responses, the binding of the sperm and egg, and the initiation of a muscle contraction. By
learning the importance of the cell membrane structures and how they function now, you will be better
prepared to understand complex body systems.
Learning Target: Use a model to determine the ways substances move across a cell membrane. (skill)
Day 1
Activity:
1. Get ready to take pictures or video.
2. Place a tea bag in a beaker 3/4 full of tap water.
3. Observe what is happening. _________________________________________________________
_________________________________________________________________________________
_________________________________________________________________________________
4. After a few minutes remove the tea bag from the water and open it. Make more observations.
_________________________________________________________________________________
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Think about it: (Use your knowledge from past science course work, resources like your book (page 59-66), or
visit the anatomy and physiology web-site to view “Movement Through the Cell Membrane”, to answer the
following questions.)
1. Selective Permeability
A. Define selective permeability.
B. How was selective permeability demonstrated in this activity?
C. Provide a specific example of selective permeability in a human cell.
2. Diffusion
A. Define diffusion and include the term concentration gradient in your explanation.
B. How was diffusion demonstrated in this activity?
C. Define equilibrium.
D. When was equilibrium achieved in this activity?
E. Name a substance that crosses a human cell membrane using diffusion.
3. Osmosis
A. Define osmosis.
B. How was osmosis demonstrated in this activity?
C. Explain osmosis in human cells using the terms isotonic, hypertonic, and hypotonic.
4. Active and Passive Transport
A. Define Active Transport.
B. Describe a real life example of active transport in a human cell.
C. Define Passive Transport.
D. Describes a real life example of passive transport in a human cell.
E. Which type of transport was represented by the tea bag activity?
Passive
Both
Active
Day 2
Explain what you know:
1. Use the app “Educreation” to teach a lesson on movements through the cell membrane. Your teacher
will assign you a specific topic.
2. Use the rubric as a guide.
3. Share your lesson with another group and clarify any confusing concepts.
4. Share your final lesson with your teacher- Hour ? / Last names / Your Assigned Topic
Task
Slide Format
Content
(Selective
permeability)
3X
Content
(Diffusion)
3X
Content
(Osmosis)
3X
Content
(Active verses
Passive
Transport)
3X
Presentation
4
Meets All Requirements
 There is a title slide with the topic and student names listed
 the background does not distract from the text
 the font is large enough to read
 handwritten items are neat
 animations work
The lesson
 defines selective permeability
 relates selective permeability to the tea bag
 provides a specific examples of a cell’s selective permeability
The lesson
 Define diffusion, concentration gradient, and equilibrium
 Relates diffusion and equilibrium to the tea bag
 provides a real life examples of substances that diffuse across
a cell membrane
The lesson
 defines osmosis
 relates osmosis to the tea bag
 explains osmosis in cells during hypertonic, hypotonic, and
isotonic conditions
The lesson
 defines active and passive transport
 describes examples of active and passive transport in cells
 explains the type of transport demonstrated by the tea bag
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

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______ / 20
vocals are loud, clearly articulated, and correct pronunciations
are used
there are no spelling or grammatical errors
pictures, video, and(or) graphics enhance the content
both partners present
3
2
1