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2.2 Animal tissues, organs and organ systems

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Question 6

Doctors assess a patient's heart before and after inserting a stent into a coronary artery narrowed by fatty material.

In each assessment, electrical impulses increase the patient's heart rate to 120 beats per minute for a short time.

AssessmentBlood flow through the affected coronary artery in cm3 per minuteContraction strength at the end of the assessment as a percentage of the starting strength
Before the stent is inserted7565
After the stent is inserted19098

Explain the differences between the results before and after the stent is inserted.

[6]
Markscheme

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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