Warm-Up Cell Homeostasis - Edgenuity Inc.

Warm-Up

Cell Homeostasis

Lesson Objectives

By the end of this lesson, you should be able to:

? Explain how cells maintain

? Differentiate between diffusion,

, passive transport, and

active transport

? Describe the

Science Practice: Generate

of homeostasis to living organisms

to utilize charts, graphs,

and tables to show

W

2K

Words to Know

Fill in this table as you work through the lesson. You may also use the glossary

to help you.

in cells, the movement of particles from an area of

high concentration to an area of low concentration

along the concentration gradient

the use of energy by a cell to move particles

against the concentration gradient from an area of

low concentration to an area of high concentration

in cells, the process of using diffusion to move

particles, without energy, across the cell from an

area of high concentration to an area of low

concentration

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Warm-Up

W

2K

Cell Homeostasis

Words to Know

in cells, the diffusion of water molecules across a

selectively permeable membrane from an area of

high water concentration to an area of low water

concentration

the state of maintaining a stable internal

environment despite changing external conditions

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Instruction

?

Cell Homeostasis

Lesson

Question

Slide

2

Balance in Cells

is the state of maintaining a

environment despite

?

?

internal

external conditions.

and carbon dioxide concentrations

of internal environment

? Nutrient and waste product

? Salt and other

?

concentrations

and pressure of extracellular fluid

Cell Membrane

? Is

permeable

?

what enters and leaves the cell

? Has a phospholipid

structure

? hydrophilic: water loving

? hydrophobic: water-resisting

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Instruction

Cell Homeostasis

Slide

5

Maintaining Homeostasis: Diffusion

?

: In cells, the

concentration to an area of

of particles from an area of

concentration along the

concentration gradient

? When molecules are evenly spaced, dynamic equilibrium is reached.

? No difference in the concentration of molecules inside and outside the

cell.

Circle the section of the diagram in which dynamic equilibrium has been reached.

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Instruction

Cell Homeostasis

Slide

5

Maintaining Homeostasis: Osmosis

: In cells, the diffusion of

molecules from an area of

high water concentration to an area of low water concentration

? hypotonic:

solute concentration, less concentrated than

solution its being compared to

? hypertonic:

solute concentration, more concentrated, than

solution its being compared to

? isotonic:

solute concentration than what its being compared

to

Label each solution in the diagram below.

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