Good Morning!
Mrs. Buonomo
Today’s warm-up activities:
1. Write your First Name on a name tag
2. Take out and read over your Cell Transport
homework assignment

Today’s Lesson: Osmosis
• Agenda
• Warm-up/Introduction - Mrs. Buonomo
• Review Diffusion/Introduce Osmosis
• Why is water important to living things?
• Review - cells and cell transport with a partner
• What is the role of the cell membrane?
• Osmosis demonstration (video)
• Exit Slip

Diffusion
• Diffusion - due to molecular motion,
molecules move from areas where they are
highly concentrated to areas where they are
less concentrated.

Osmosis
Diffusion of water through
the cell membrane
What role does
osmosis
play in living things?
Main Concept

Why is water important to living things?
• Water helps cells maintain their size and
shape
• Water is important for many chemical
reactions in cells
• Water helps transport oxygen and nutrients
through the blood
• Water helps with elimination of waste
materials
• Water helps with temperature regulation
• Water helps lubricate joints

Cell Transport HW and Vocabulary Review
• Review - Cells and Cell Transport
• The _____ is the basic unit of life. Every organism is either made up of large interconnected groups
of cells or is itself a cell, free-floating and independent. Given the diversity of life that exists on
Earth, there is a vast variety of cell types. The human body alone contains more than two hundred
different kinds of cells that vary in size, shape, and function.
• The cell _____________ is critical to the survival of a cell. It acts as a _____________ between the cell
and its environment, keeping the cytoplasm and organelles inside and harmful organisms and
particles ________.
• There may be a dozen different types of materials passing through the ______________ of a cell at
any one time. The job of the membrane is to _________________ this movement in order to maintain
the proper balance of ions, water, oxygen, carbon dioxide, nutrients, and other ________________.
• The ______ ______________, also called the plasma membrane, functions more like a bag of tightly
woven fabric than like a wall. The membrane allows some molecules, including ______ like oxygen
and carbon dioxide to pass readily through its surface. Water and other small ____________ also
move into and out of the ______ with relative ease. Other substances, however, can move into or out
of the cell only through special openings called ion channels, GluT transporters, and protein pumps.

Completed Vocabulary Review
• Review - Cells and Cell Transport
• The cell is the basic unit of life. Every organism is either made up of large interconnected
groups of cells or is itself a cell, free-floating and independent. Given the diversity of life that
exists on Earth, there is a vast variety of cell types. The human body alone contains more than
two hundred different kinds of cells that vary in size, shape, and function.
• The cell membrane is critical to the survival of a cell. It acts as a boundary between the cell
and its environment, keeping the cytoplasm and organelles inside and harmful organisms
and particles out.
• There may be a dozen different types of materials passing through the membrane of a cell at
any one time. The job of the membrane is to regulate this movement in order to maintain the
proper balance of ions, water, oxygen, carbon dioxide, nutrients, and other molecules.
• The cell membrane, also called the plasma membrane, functions more like a bag of tightly
woven fabric than like a wall. The membrane allows some molecules, including gases like
oxygen and carbon dioxide to pass readily through its surface. Water and other small
molecules also move into and out of the cell with relative ease. Other substances, however,
can move into or out of the cell only through special openings called ion channels, GluT
transporters, and protein pumps.

A closer look at the cell
membrane
The cell membrane is semipermeable, which means that it
allows certain substances to enter and exit the cell.
Video: http://youtu.be/-aSfoB8Cmic

Osmosis in Action
• Video: http://youtu.be/eQsAzXr0UCU

Osmosis
Diffusion of water through
the cell membrane
Movement through a
semipermeable membrane
that regulates movement of
substances into and out of
the cell
What role does Water moves from an area
osmosis with a higher concentration
play in living things? of water to an area with a
lower concentration of
Main Concept water
Energy is not required
(passive transport)
A plant’s many, fine roots
draw water from the soil A potato slice will shrink when
through osmosis added to a high concentration of
salt solution