1. Figure 1 shows a diagram of the heart - Edexcel - GCSE Biology - 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 - 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
In the diagram, draw arrows starting from the pulmonary vein, moving into the left atrium, then to the left ventricle, and finally to the aorta, indicating the flow of oxygenated blood.
Step 2
What happens when the right ventricle contracts?
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Answer
When the right ventricle contracts, valve T closes, which prevents the backflow of blood and ensures that blood is forced into the pulmonary artery.
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 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
The valves in veins close to prevent backflow of blood, ensuring that blood flows in one direction towards the heart even under low pressure.
Step 5
State why this equipment was put into disinfectant.
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Answer
The equipment was put into disinfectant to kill bacteria, pathogens, or microorganisms, ensuring that it is sterile for future use.
