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Tonicity

Tonicity

Assessment

Presentation

Biology, Science

9th Grade

Easy

Created by

Jeremy Buie

Used 77+ times

FREE Resource

9 Slides • 1 Question

1

Tonicity & Homeostasis

Module C: Cell Transport & Energy

2

​Review

Osmosis

  • Osmosis is the movement of water from areas of high concentration to low concentration.

  • Water moves across the cell membrane without the use of energy (ATP).

  • This balance/movement of water is extremely important to cellular structure.​

Module C: Cell Transport & Energy

3

Lesson Guiding Questions

What is a solution? How do we describe them?

How does water move in different solutions?

4

What is a solution?

Solutions

  • Solutions are made when solutes are added to solvents.

  • For example, salt (solute) added to water (solvent) = salt water (solution)

  • Solutions are described by their solute concentrations.​

  • Solutions can be classified in 3 different ways: isotonic, hypotonic, or hypertonic.

Module C: Cell Transport & Energy

5

media
  • In isotonic solutions, the solute concentration is equal on both sides of the cell membrane.

  • Water moves in both directions equally.

  • The cell's structure (in animals) remains intact.​

Module C: Cell Transport & Energy

Isotonic Solutions

6

media
  • In hypotonic solutions, the solute concentration is LOWER (water concentration is HIGHER) outside of the cell than inside the cell.

  • Water moves into the cell (down the concentration gradient).

  • The cell gets larger.

  • "Hypo" = "hippo"​

Module C: Cell Transport & Energy

Hypotonic Solutions

7

media
  • In hypertonic solutions, the solute concentration is HIGHER (water concentration is LOWER) outside of the cell than inside the cell.

  • Water moves out of the cell (down the concentration gradient).

  • The cell gets smaller.

Module C: Cell Transport & Energy

Hypertonic Solutions

8

9

Open Ended

Explain why animal cells function best in isotonic environments.

10

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Mr. Buie

Tonicity & Homeostasis

Module C: Cell Transport & Energy

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