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2.2 Animal tissues, organs and organ systems

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Question 26

During heart surgery, a device sends electrical impulses to the heart muscle. The device initially sends one impulse every 0.80 seconds. The interval between impulses is then changed to 0.60 seconds.

Describe how this change affects the contractions of the heart muscle. Use the action of electrical impulses in your answer.

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2.2 Animal tissues, organs and organ systems Questions

  1. GCSE
  2. /Biology
  3. /2.2 Animal tissues, organs and organ systems

304 exam-style questions on AQA GCSE Biology 2.2 Animal tissues, organs and organ systems, covering 2.2.1 The human digestive system, 2.2.2 The heart and blood vessels, 2.2.3 Blood, 2.2.4 Coronary heart disease: a non-communicable disease, 2.2.5 Health issues, 2.2.6 The effect of lifestyle on some non-communicable diseases, and 2.2.7 Cancer. Each one has a worked solution and a mark scheme showing where the marks go.

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