Figure 2 shows a photograph of a dissected heart - AQA - A-Level Biology - Question 3 - 2019 - Paper 3
Question 3
Figure 2 shows a photograph of a dissected heart.
Name valve A and chamber B.
Valve A
Chamber B
Give two safety precautions that should be followed when dissecti... show full transcript
Worked Solution & Example Answer:Figure 2 shows a photograph of a dissected heart - AQA - A-Level Biology - Question 3 - 2019 - Paper 3
Step 1
Name valve A and chamber B.
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Answer
Valve A: (Left) atrioventricular
Chamber B: Left ventricle
Step 2
Give two safety precautions that should be followed when dissecting a heart.
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Answer
Use a sharp scalpel/scissors.
Wash hands/wear gloves.
Step 3
Explain how valve A in Figure 2 maintains a unidirectional flow of blood.
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Answer
Valve A ensures that blood flows in one direction by opening when the pressure in the left atrium is higher than in chamber B (the left ventricle), allowing for filling. When the left ventricle contracts, the pressure rises, which closes the valve to prevent backflow into the atrium.
