Topic: Cell Processes
Aim: Explain the two types of cell
transport.
Do Now: Define the term
“concentration.”
HW: Work on your science fair project.
The sum of all life processes is
known as
a. Regulation
b. Metabolism
c. Transport
d. Excretion
Metabolism is best described as:
(multiple choice)?
a. control of enzyme activity
b. synthesis of macromolecules
c. breakdown of macromolecules
d. A and B
e. A,B, and C
Transport • Circulation
• Movement of
materials into and out
of cells
The chloroplasts move around inside the
cell = TRANSPORT
Passive
Transport
• Materials move from
high  low concentration
• NO ENERGY NEEDED
Weeee!!!
high
low
2 Types of Passive Transport
1. Diffusion:
movement of
materials
from HIGH
to LOW
concentration
DIFFUSION
LOW
HIGH
• Molecules move until
concentration becomes equal
on both sides (equilibrium)
Cell membrane
Inside cell
Outside cell
Cell membrane
diffusion
Inside cell
Outside cell
Diffusion through a membrane
Cell membrane
Inside cell
Outside cell
EQUILIBRIUM
2.Osmosis: diffusion of WATER
• Movement of WATER from
HIGH to LOW concentration
Topic: Cell Processes
Aim: Explain the two types of cell
transport.
Do Now: Define the term
“concentration.”
HW: Work on your science fair project.
• http://zoology.okstate.edu/zoo_lrc/biol1114
/tutorials/Flash/Osmosis_Animation.htm
Osmosis
Cell membrane
Inside cell
High conc. of water
molecules.
Outside cell
Low conc. of water
molecules.
Osmosis
Cell membrane
OSMOSIS
Inside cell
High conc. of water
molecules.
Outside cell
Low conc. of water
molecules.
Osmosis
Cell membrane
OSMOSIS
Inside cell
Outside cell
EQUILIBRIUM. Equal water
concentration on each side.
LOW
HIGH
+ energy
http://www.youtube.com/watch?v=1w10R9lv7eQ&feature=related
Active
• Movement of materials
Transport from LOW to HIGH
concentration
• ENERGY IS NEEDED!
Let’s summarize:
1. Explain the differences between passive
transport and active transport.
2. What is the difference between diffusion and
osmosis?
3. When will diffusion stop?
http://www.youtube.com/watch?v=1ZFqOvxXg9M
Review:
Which process requires cellular
energy?
1. diffusion
2. passive transport
3. active transport
4. osmosis
Sodium ions are pumped from a region
of lower concentration to a region of
higher concentration in the nerve cells
of humans. This process is an example
of
1. diffusion
2. osmosis
3. passive transport
4. active transport
The movement of materials from
lower to higher concentration
requiring energy in the form of
ATP is called
1. movement
2. diffusion
3. active transport
4. cell division
The movement of materials from
higher to lower concentration
is called
1. diffusion
2. active transport
3. pinocytosis
4. 4. phagocytosis
Damage to which structure will most
directly disrupt water balance
within a single-celled organism?
1. ribosome
2. cell membrane
3. nucleus
4. chloroplast
The movement of water from an
area of high concentration to an
area of low concentration is
known as
1. phagocytosis
2. osmosis
3. active transport
4. pinocytosis