Unit 3 B –
Cell Transport
Name:
Block :
Topic: ________________________________________________________________
Learning Target: How does the _________________________________________
________________________________________________________________
SOL: _____________
Essential Knowledge: The student will ________________________________________
_____________________________________________________________________
Cell Membrane
what enters and exits the cell, maintaining
•
•
Provides
Structure of the Cell Membrane
•
Fluid Mosaic Model – flexible organization of a mixture of
Lipid BiLayer
•
Two layers of
– Allows the cell membrane to be
Cell Membrane Proteins

Transport Protein: provide a
so molecules can enter
and exit the cell.

Receptor Protein:
shaped proteins that aid in
&
Real Life Cell to Cell Communication in the Human
Body
•
•
•
•
To maintain homeostasis, cells must communicate.
Cells communicate using two body systems:
Nervous System (Neurotransmitters)
Endocrine System (Hormones)
Topic: ________________________________________________________________
Learning Target: How do _________________________________________
________________________________________________________________
SOL: _____________
Essential Knowledge: The student will ________________________________________
_____________________________________________________________________
Selectively Permeable

Cell membrane
which materials enter and exit the cell based on
o Harmful substances (
) may enter the cell
Only SMALL molecules can DIFFUSE through a membrane.
Small Molecules
•
Easily
through the cell membrane
•
Large Molecules
•
Large organic molecules
easily pass through
the cell membrane
•
They need to be
•
Starch 
•
Proteins 
•
Lipids  Fatty Acids + Glycerol
into their building blocks
What Would Happen in This Set Up?
(The dashed line serves as the cell membrane)
Remember! Only SMALL molecules can DIFFUSE through a membrane.
1. What does the term selectively permeable mean?
2. What molecules are able to easily pass through the membrane?
3. Explain how large molecules are able to diffuse the cell membrane.
4. Explain how the selectively permeable cell membrane aids in the maintenance of
homeostasis.
Cellular Transport
•
The cell membrane controls the movement of materials into and out of the cell
•
Types of cell transport:
Diffusion
•
Movement of molecules from
•
•
Real Life Examples of Diffusion
Can you think of any other examples?
Why does Diffusion Occur?
!
the number of molecules on each
side of the cell membrane to determine the
concentration gradient.
•
What is the concentration gradient for Oxygen?
•
Will Oxygen move INTO or OUT of the cell?
•
What is the concentration gradient for molecule 1?
Facilitated Diffusion
•
Movement of molecules from
a
to
concentration using
•
Dynamic Equilibrium
•
Molecules
molecules on both sides of the membrane
causing
of
Topic: ________________________________________________________________
Learning Target: How do____ _________________________________________
________________________________________________________________
SOL: _____________
Essential Knowledge: The student will ________________________________________
_____________________________________________________________________
Active Transport
•
•
Movement of
the concentration gradient
•
Determine the concentration for molecule 3.
If molecule 3 moves OUT of the cell, is that active or passive transport? Explain your
reasoning.
Types of Active Transport
•
•
_______________________- Taking material into the cell
-
_______________________- cell eating
-
_______________________- cell drinking
_______________________- Removing waste and sending it out of the cell
Transport Summary – What type is represented in each diagram below?
Topic: ________________________________________________________________
Learning Target: How is______________________________________________
________________________________________________________________
SOL: _____________
Essential Knowledge: The student will ________________________________________
_____________________________________________________________________
Osmosis
molecules
•
from
water concentration to
water concentration
•
H2Osmosis
•
\
Solute - substance dissolved
in another substance
Cells in Distilled Water Solution
•
Water moves
the cell from
to
concentration
•
Problem: Animal cells gain water,
•
Plant cells
–
Real Life Example of a Cell Living in a DISTILLED
– Why?
Environment
 Paramecium are single-celled freshwater
organisms

Water continually enters the cell due to osmosis

Cell has a contractile vacuole to pump out the
excess water
Cells in Salt Solution
•
Water moves
the cell from
to
•
concentration
Problem:
– Animal cells
– Plant cells undergo
•
Cytoplasm
Real Life Example of a Cell Living in Hypertonic
Environment (Salt Water)
•
During the winter, salt on the road NEGATIVELY affects plants. This is because water diffuses
out of their cells (highlow concentration).
Cells in Balanced Conditions
•
Balanced conditions
– The water concentration on both sides of the membrane is
– Real-life example: blood
•
Problem: None
–
Water flows across membrane equally in both
directions
Osmosis Review – What type of water was each of the cells placed in? How can you tell?
Solution
Reasoning