2-3 Outline Moving Cellular Material - readington.k12.nj.us
Name
Date
Class
Lesson Outline
LESSON 3
Moving Cellular Material
A. Passive Transport
1. A cell membrane is certain substances to enter or leave a cell.
, which means that it allows only
2. Passive transport is the movement of substances through a cell membrane without
using the cell's
.
B. Diffusion
1. Diffusion is the movement of substances from an area of
concentration to an area of
concentration.
2. Usually diffusion continues through a membrane until the
membrane.
of a substance is the same on both sides of the
C. Osmosis--The Diffusion of Water
1. Osmosis is the diffusion of membrane.
molecules only through a
2. If the concentration of water in the air surrounding a plant is less than the concentration of water inside the plant's vacuoles, water will diffuse into the
until the concentrations of water are equal.
3. Facilitated diffusion allows molecules to pass through a cell membrane using
proteins.
a. Carrier proteins carry
through the cell membrane.
b. membrane.
proteins allow ions to pass through the cell
D. Active Transport
1. Active transport uses the cell's through a cell membrane.
to move substances
2. Active transport moves substances from areas of
concentration to areas of
concentration.
Copyright ? Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
48
Cell Structure and Function
Name
Date
Class
Lesson Outline continued
3. A cell uses with the cell membrane.
to take in a substance by surrounding it
4. A cell's vesicles release their contents outside the cell
during
.
E. Cell Size and Transport
1. For a cell to survive, its surface area must be large compared to
its
.
2. As a cell
, its volume increases faster than its surface area.
Copyright ? Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
Cell Structure and Function
49
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