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Overview

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.

Contents
	There are 6 sections (and a quiz) in this electronic resource (e-source): The body's transport system Blood pressure Heart structure and action Supply and demand Heart risks Modern medicines Quiz

"The Heart and Circulation"
was developed by schoolscience.co.uk

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.