Figure 1 shows a diagram of the heart - Edexcel - GCSE Biology Combined Science - Question 1 - 2020 - Paper 1
Question 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 ventr... show full transcript
Worked Solution & Example Answer: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
In Figure 1, to illustrate how oxygenated blood moves through the heart, arrows should be drawn starting from the left ventricle, moving through the aorta to the body. From the body, deoxygenated blood returns to the heart via the vena cavae, entering the right atrium, moving to the right ventricle, and then into the pulmonary artery to the lungs for oxygenation.
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 into the right atrium, and blood is forced into the pulmonary artery. Therefore, the correct answer is:
C. blood is forced into the pulmonary vein.
Step 3
Draw one straight line from each structure to its function.
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Answer
The correct matches are:
pulmonary vein ➔ carries blood from the lungs to the heart
left ventricle ➔ forces blood towards the lungs.
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 help blood flow towards the heart by closing to prevent backflow. This ensures that, despite the low pressure in veins, blood continues to move in the correct direction toward the heart.
Step 5
State why this equipment was put into disinfectant.
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Answer
The equipment used to dissect the vein was put into disinfectant to prevent contamination and maintain a sterile environment, thus ensuring safety and validity in the experiment.
