Download Do you agree or disagree?

LESSON
3
Moving Cellular Material
LESSON INTRODUCTION
Get Ready
What do you think?
Before you begin, decide if you agree or disagree
with each of these statements.
As you view this presentation, see if you change
your mind about any of the statements.
LESSON
3
Moving Cellular Material
LESSON INTRODUCTION
Get Ready
Do you agree or disagree?
•
Diffusion and osmosis are the same process.
•
Cells with large surface areas can transport
more than cells with smaller surface areas.
LESSON
3
Moving Cellular Material
LESSON INTRODUCTION
Key Concepts/Essential Questions
• How do materials enter and leave cells?
• How does cell size affect the transport of
materials?
LESSON
3
Moving Cellular Material
LESSON INTRODUCTION
Vocabulary
Watch out for these words!
• passive transport
• active transport
• diffusion
• endocytosis
• osmosis
• exocytosis
• facilitated diffusion
LESSON
3
Moving Cellular Material
LESSON INTRODUCTION
Why the Veil?
Look at the photo at the beginning of the
lesson. A beekeeper often wears a helmet
with a face-covering veil made of mesh. The
openings in the mesh are large enough to let
air through, yet small enough to keep bees
out. In a similar way, some things must be
allowed in or out of a cell, while other things
must be kept in or out. How do the right
things enter or leave a cell?
LESSON
3
Moving Cellular Material
LESSON
3
Moving Cellular Material
LESSON WRAP-UP
Lesson Review
Do you agree or disagree?
Diffusion and osmosis are the same process.
Disagree. Osmosis is the transport of water, and
diffusion is the movement of other substances.
LESSON
3
Moving Cellular Material
LESSON WRAP-UP
Lesson Review
Do you agree or disagree?
Cells with large surface areas can transport more
than cells with smaller surface areas.
Agree. To move substances into and out of a cell
efficiently, the surface area of a cell must be large
compared to its volume.
LESSON
3
Moving Cellular Material
LESSON WRAP-UP
Key Concept/Essential Question Review
How do materials enter and leave cells?
Materials enter and leave a cell through the cell
membrane using passive transport or active transport.
LESSON
3
Moving Cellular Material
LESSON WRAP-UP
Key Concept/Essential Question Review
How does cell size affect the transport of
materials?
The ratio of surface area to volume limits the size of a
cell. In a smaller cell, the high surface-area-to-volume
ratio allows materials to move easily to all parts of a
cell.