Topic Ten (1.10): Movement of substances

Topics Icon.png Objectives

By the end of this topic you should be able to:

  • name some substances that move into and out of cells
  • describe the process of diffusion.

Introduction Icon.png Introduction

In this topic, you will find out how lots of substances move in and out of cells.

Interact Icon.png Working through your coursebook

  • Read pages 32-33 in Activate 1.
  • Diffusion is the movement of particles from a high concentration to a low concentration. It is responsible for the movement of oxygen into the blood from the alveoli in the lungs, for carbon dioxide leaving respiring cells and for plants wilting.
  • Pay close attention to the diagrams on page 33.
  • Watch this video on diffusion in cells:

  • Fill in the blanks in this worksheet:

COMPLETE – Diffusion Summary Worksheet Download COMPLETE – Diffusion Summary Worksheet

Review Icon.png Review

COMPLETE – (Question 5) Biology 1 Vocab Builder 1 (Kerboodle)  Links to an external site.

Answer the Summary Questions on page 33.

Bridge Icon.png Support activity for this topic

Watch this Revision Monkey video to understand diffusion better: 

Stretch Icon.png Extension activity for this topic

This experiment is popular for studying diffusion. This time, they are looking at how the shape of the agar jelly affects diffusion:

EXPLORE - Agar cube diffusion (Twig) [Not available on sample course]

Download Icon.png Check your answers

CHECK – Diffusion Summary Worksheet - Mark Scheme Download CHECK – Diffusion Summary Worksheet - Mark Scheme

CHECK - Student Book Answers B1 Chapter 1 (Kerboodle) [Not available on sample course]