BIOL 211 -
CELLULAR AND ORGANSIMAL BIOLOGY
Lecture
Outline for
Topic: Cell Membrane Function
Chapter 4 section 4.1
Figures used in lecture: 4.4.
4.5, 4.6, 4.7, 4.8, 4.9
Additional Resources
Transport
across cell membranes – including diffusion, active transport, osmosis
Key Words
passive transport, simple diffusion, facilitated diffusion,
active transport
Be
able to use your knowledge of cell membrane structure and function to answer
this question.
Two of the symptoms of
diabetes are excessive thirst and frequent urination. Why?
Membrane Functions
1. To isolate the cell's contents from the
external environment.
Be able to explain how the phospholipid bilayer performs
this function.
2. To regulate the passage of materials into and
out of the cell.
Be able to explain how membrane proteins
perform this function.
3. To communicate with other cells.
Be able to explain how membrane
carbohydrates perform this function.
Transport Across Membranes
Be able to describe the
features of each of the following types of movement across membranes:
1. Passive Transport
a.
diffusion
1.) simple diffusion
2.) facilitated diffusion
b.
osmosis
2. Active Transport