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The heart as a double pump

The heart as a double pump

Frontal section of the human heart showing its four chambers, major vessels, septum, valves, blood-flow arrows, and the thicker wall of the left ventricle The heart is made mainly of cardiac muscle, which contracts and relaxes rhythmically without becoming fatigued. Its right side pumps deoxygenated blood to the lungs, while its left side pumps oxygenated blood around the body.

2.2.4 The heart and blood vessels Lesson

  1. GCSE
  2. /Biology
  3. /2.2.4 The heart and blood vessels

Step-by-step lessons on OCR GCSE Biology 2.2.4 The heart and blood vessels. Each one builds up to exam-style questions. Start with the foundational topics and build up to the higher-tier material.

Lessons