A-LevelBiologyTransport in mammals9700/12 · Oct/Nov 2011 · Q241 Mark
The diagram shows pressure changes in the aorta, left atrium and left ventricle during a cardiac cycle. [Figure 24] Which row explains the changes in the left ventricle at different times on the graph?
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Aregion of graph: between 1 and 2, muscles of ventricle wall: contract, volume of left ventricle: remains constant
Bregion of graph: between 2 and 3, muscles of ventricle wall: relax, volume of left ventricle: increases
Cregion of graph: between 3 and 4, muscles of ventricle wall: contract, volume of left ventricle: remains constant
Dregion of graph: between 4 and 5, muscles of ventricle wall: relax, volume of left ventricle: decreases
✓ Correct answer
A: region of graph: between 1 and 2, muscles of ventricle wall: contract, volume of left ventricle: remains constant
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