1. Figure 1 shows a diagram of the heart - Edexcel - GCSE Biology: Combined Science - Question 1 - 2020 - Paper 1
Question 1
1. Figure 1 shows a diagram of the heart.
(a) (i) Draw arrows on Figure 1 to show how oxygenated blood moves through the heart.
(ii) What happens when the right ve... show full transcript
Worked Solution & Example Answer:1. Figure 1 shows a diagram of the heart - Edexcel - GCSE Biology: Combined Science - Question 1 - 2020 - Paper 1
Step 1
Draw arrows on Figure 1 to show how oxygenated blood moves through the heart.
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Answer
To illustrate how oxygenated blood flows, arrows should be drawn from the left ventricle to the aorta, indicating that oxygenated blood is pumped out to the body.
Step 2
What happens when the right ventricle contracts?
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Answer
When the right ventricle contracts, valve T closes and blood is forced into the pulmonary artery to the lungs. The correct options are B and D.
Step 3
Draw one straight line from each structure to its function.
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Answer
Pulmonary vein: carries blood from the lungs to the heart
Left ventricle: forces blood towards the body organs.
Step 4
Explain how the valves in veins help the blood, at low pressure, flow towards the heart.
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Answer
Valves in veins close to prevent backflow of blood, ensuring that it continues to push toward the heart despite the low pressure.
Step 5
State why this equipment was put into disinfectant.
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Answer
The equipment was put into disinfectant to eliminate any potential pathogens and ensure that it is sterile for further use.
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