Passive Transport
Learning Targets
 Compare and contrast active transport (sodium potassium pump, endocytosis and exocytosis) and passive transport
(diffusion and osmosis).
 Explain the effects of a hypotonic, hypertonic, and isotonic environment on a cell.
1. What do you think is meant by “selectively permeable”?
2. Describe osmosis.
3. List and describe the 3 possible cell shapes.
4. Use the microscope to view the red blood cells and sketch the images. Describe the appearance of each.
ISOTONIC 1200X
HYPOTONIC 1200X
HYPERTONIC 1200X
5. After viewing and learning about isotonic, hypotonic, and hypertonic soltuons: describe what you think happened to the
red blood cells?
Isotonic
Hypotonic
Hypertonic
6. Which direction did water flow in each (in, out, or equally)?
Isotonic
Hypotonic
Hypertonic
7. What do you know about the concentrations of water inside and outside of the red blood cell in each situation (higher,
lower, same)?
Isotonic
Hypotonic
Hypertonic