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2.2.2 The heart and blood vessels
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The Double Circulatory System

The Double Circulatory System

Labelled double circulatory system showing the heart, lungs, body, major vessels, and direction of blood flow

The heart is a muscular organ that works as two pumps side by side. In a double circulatory system, blood passes through the heart twice during one complete circuit: once through the lungs and once through the rest of the body.

2.2.2 The heart and blood vessels Lesson

  1. GCSE
  2. /Biology
  3. /2.2.2 The heart and blood vessels

Step-by-step lessons covering AQA GCSE Biology 2.2.2 The heart and blood vessels for Foundation and Higher tier. Each lesson works through exam-style questions in Paper 1 and Paper 2 format. Start with the foundational topics and build up to the higher-tier material.