Skip to content

Course home

2.2 Animal tissues, organs and organ systems

2.2 Animal tissues, organs and organ systems

EasyMediumHard
12
Question 1

A clinical study compared two methods of treating a severely leaking mitral heart valve in elderly patients:

  • Surgical Mitral Valve Repair (SMVR) (traditional open-heart surgery)
  • Percutaneous Mitral Valve Repair (PMVR) (a minimally invasive catheter-based procedure)

The data from the study is shown in the table below:

MeasurementSMVRPMVR
Number of patients in the study450045004500320032003200
Number of patients experiencing severe post-operative infection within 30 days270270270484848
Percentage of patients alive after 5 years82%82\%82%76%76\%76%
Percentage of patients requiring a secondary re-intervention within 2 years3.5%3.5\%3.5%14.0%14.0\%14.0%
a.

Explain how a severely leaking mitral valve leads to a reduced ability to perform aerobic exercise.

[4]
b.

Give one conclusion comparing the rate of severe post-operative infection within 30 days between the two groups. Include calculations of percentages to support your conclusion.

[3]
c.

Based on the data provided and your biological knowledge, evaluate the choice of PMVR compared to SMVR.

[4]
Markscheme

2.2 Animal tissues, organs and organ systems Questions

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

44 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.

Question bank