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 Figure 1, draw three arrows indicating the flow of oxygenated blood from the left ventricle to the body, and then back to the pulmonary vein and left atrium.
Step 2
What happens when the right ventricle contracts?
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Answer
When the right ventricle contracts, blood is forced into the pulmonary vein (option D), which carries deoxygenated blood to the lungs for oxygenation.
Step 3
Draw one straight line from each structure to its function.
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Answer
For the structure 'pulmonary vein', the function is 'carries deoxygenated blood'. For the 'left ventricle', the function is '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. When blood returns to the heart, the valves open, allowing blood to flow through. This mechanism ensures that blood flows in one direction 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 kill bacteria, pathogens, or microorganisms, ensuring it is safe for use.
