We will learn about the basic structure of the plasma membrane.
Before we move on, students should write down what this quote means to them and why this is important. (There is no wrong answer)
Questions: 1) Why do you think the plasma membrane is important to the cell? 2) Can you think of a few functions of plasma membrane?
Have students draw their own plasma membrane to better understand its structure.
By: Ismael Rodriguez
> The cell is the smallest unit of life classified as a living thing.> It is the structure of all living things on earth.> We will focus on the structure of the plasma membrane of thecell and some of its basic functions.
> The plasma membrane is a thin membrane that surrounds and defines theboundaries of all living cells.> It consists of a double layer, also know as the bilayer, of phospholipids withvarious proteins attached to it.> Cell membranes define and compartmentalize space, regulate the flow ofmaterials, detect external signals, and mediate interactions between cells.
PROTEINS IN THE CELL PLASMAMEMBRANE> In the plasma membrane we have peripheral proteins and integral proteins.> Integral proteins penetrate the bilayer from the extracellular fluid to the cytoplasm.> Peripheral proteins are attached to the integral proteins and don’t cross themembrane.
The plasma membrane acts as a barrier and separates the outsideof the cell from the inside. It is selectively permeable to ions and inorganic molecules,meaning it controls the movement of molecules in and out of thecell.
>The plasma membrane is mainly composed ofphospholipids.>The polar heads are hydrophilic and the nonpolar tailsare hydrophobic.
Cholesterol helps maintain the integrity of the membranes and plays animportant role in facilitating cell signaling so that the cells can communicatewith each other.
1st2nd3rd4th> The break down from the cell to thephospholipids.
QuizTimeA B C DEFFirst: Draw your own plasma membraneSecond: Label Letters A-F, for B and C what type of proteins arethey?Third: For letter E state the hydrophobic and hydrophilic sections.Fourth: State where the cytoplasm and the extracellular fluid are
> This website is a great place for students who areinterested in looking at the plasma membrane in moredetail.http://www.bio.davidson.edu/people/macampbell/111/memb-swf/membranes.swfFurther Information