The heart and circulation
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Animation of heart monitor
Picture 1.1 A screen from a heart monitor.
Humans are made up of billions of cells. Each one needs its own supply of nutrients & oxygen and to have its waste products removed. That is the job of the heart and circulation.
There are 6 sections (and a quiz) in this electronic resource (e-source):
  1. The body's transport system
  2. Blood pressure
  3. Heart structure and action
  4. Supply and demand
  5. Heart risks
  6. Modern medicines
  7. Quiz
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Using this e-source
There are a number of interactive features in this e-source:

A glossary of terms: any word with a glossary entry is highlighted like that. Clicking on the word will open a new window with a definition of that word.

Quick questions: at the end of e-source, there is a set of quick questions to test your understanding of the scientific ideas.

Roll over diagrams: many of the diagrams have highlights or sequences. You can see these by rolling your cursor over part of the picture or part of the text. The text has a roll over highlight like that.