Biology 9700 · AS & A Level · The heart

The heart — practice question

One congenital heart defect is known as atrial septal defect (ASD), in which the left and right atria are not fully separated. ASD typically causes blood to flow from the left atrium to the right atrium. As a result, blood pressure in the right atrium rises and blood pressure in the left atrium falls. Which row shows the other effects of ASD on blood pressure and oxygenation?

  • Ablood pressure in pulmonary artery decreased; blood pressure in aorta increased; % oxygenation of blood in pulmonary artery decreased
  • Bblood pressure in pulmonary artery decreased; blood pressure in aorta increased; % oxygenation of blood in pulmonary artery increased
  • Cblood pressure in pulmonary artery increased; blood pressure in aorta decreased; % oxygenation of blood in pulmonary artery decreased
  • Dblood pressure in pulmonary artery increased; blood pressure in aorta decreased; % oxygenation of blood in pulmonary artery increased

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