Lesson 3 | Moving Cellular Material - Schoolwires

Lesson 3 | Moving Cellular Material

Student Labs and Activities

Launch Lab Content Vocabulary Lesson Outline MiniLab Content Practice A Content Practice B Math Skills School to Home Key Concept Builders Enrichment Challenge Skill Practice

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Cell Structure and Function

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Launch Lab

LESSON 3: 5 minutes

What does the cell membrane do?

All cells have a membrane around the outside of the cell. The cell membrane separates the inside of a cell from the environment outside a cell. What else might a cell membrane do?

Procedure

1. Read and complete a lab safety form.

2. Place a square of wire mesh on top of a beaker.

3. Pour a small amount of birdseed on top of the wire mesh. Record your observations below.

Data and Observations

Copyright ? Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.

Think About This

1. What part of a cell does the wire mesh represent?

2. What happened when you poured birdseed on the wire mesh?

3.

Key Concept How do you think the cell membrane affects materials that enter

and leave a cell?

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Cell Structure and Function

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Content Vocabulary

LESSON 3

Moving Cellular Material

Directions: Write the correct term in the boxes to the right of each definition. Then use the letters in the numbered boxes to spell a seventh term.

active transport facilitated diffusion

diffusion osmosis

endocytosis passive transport

exocytosis

1. occurs with the help of transport proteins

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9

2. movement through a cell's membrane

without using the cell's energy

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7

3. movement through a cell's membrane

that requires energy

5

4. when a vesicle releases its contents outside of a cell

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6

5. movement of substances from higher to lower concentration

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2

6. diffusion of water molecules

4

7. is the process during which a cell takes in a substance by surrounding it with the cell membrane.

Copyright ? Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.

Cell Structure and Function

47

Name

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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.

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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

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