Download The Cell Membrane

Separating the Inside from the Outside for 3.8 billion years
Cell Parts

Over the next week or so, we will be
investigating the different parts that cells
are made of.

Cell parts are called organelles. You
can think of them as the “organs” of a
cell.
Systems

A cell is a chemical system that carries
out all of the functions of life.

A car is a system for transportation

Think of as many different parts of a car
as you can.
The Car as a System
A car is a system with many different parts.
 Each part has a structure (what it is) and a
function (what it does).
 Fill out the car chart on your notes with your ideas.

Systems Logic

Everything is a system. The Universe, you,
this classroom, atoms… everything.

Systems are made of different parts that
work together to make the system behave
the way it does.

If one part of a system changes, the
behavior of the entire system may change.
Cells: Systems of Life
The parts of a cell work together to carry
out all of the functions of life.
 If any of those parts change or
malfunction, the entire system may not
work as well, or at all.
 Every cell part plays an important part

About Yesterday’s Fictitious Cells

Cells can carry out all of the functions of life.

Cell parts, called organelles, are sub-cellular
structures that carry out the jobs of a cell.

Every organelle has a structure (what it is /
looks like) and a function (what it does)
The Cell Membrane

A cell
membrane
(sometimes
called a
plasma
membrane)
surrounds all
living cells
Cell
Membrane
Structure

The cell
membrane is a
phospholipid
bilayer.
Let’s take another look:
HYDROPHILIC – loves water
HYDROPHOBIC – fears water
A Bilayer!!!!
HYDROPHILIC
HYDROPHOBIC
HYDROPHILIC

Phospholipid Bilayer – two rows of phospholipids
that surround every cell.
Cell Membrane Structure

Proteins are
also an
important
part of the
cell
membrane
Parts of the Cell Membrane
Function of the Cell Membrane

The function of the cell membrane is to
control what materials enter and exit a
cell
Cell Membrane Recap

Structure: Phospholipid bilayer with
proteins.

Function: Controls what enters and
exits a cell.
Homework

“Cell Membrane” pp. 73-75