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 ... 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
Arrows should indicate the direction of oxygenated blood from the pulmonary vein to the left atrium, then to the left ventricle, and subsequently to the aorta.
Step 2
What happens when the right ventricle contracts?
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Answer
When the right ventricle contracts, valve T closes to prevent backflow, and 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, ensuring that blood flows in one direction towards the heart, even under low pressure conditions.
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.
