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A closed, double circulatory system

A closed, double circulatory system

Double circulatory system showing the pulmonary circuit between the heart and lungs and the systemic circuit between the heart and body organs The human circulatory system consists of the heart, blood vessels and blood. It is closed because blood remains inside vessels rather than flowing freely through the body cavity.

2.2.3 The human circulatory system Lesson

  1. GCSE
  2. /Biology
  3. /2.2.3 The human circulatory system

Step-by-step lessons on OCR GCSE Biology 2.2.3 The human circulatory system. Each one builds up to exam-style questions. Start with the foundational topics and build up to the higher-tier material.

Lessons