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8. Fig - OCR - GCSE Physical Education - Question 8 - 2020 - Paper 1
Question 8
8. Fig. 2 shows a diagram of the heart. (a) Using Fig. 2, draw an X to indicate the location of one of the semilunar valves. Valves help prevent the backflow of bl... show full transcript
Worked Solution & Example Answer:8. Fig - OCR - GCSE Physical Education - Question 8 - 2020 - Paper 1
Step 1
Using Fig. 2, draw an X to indicate the location of one of the semilunar valves.
Answer
To answer part (a), locate one of the semilunar valves in the diagram provided (Fig. 2). The semilunar valves are located at the exits of the ventricles. You may choose to place an X either at the pulmonary valve or the aortic valve. Ensure that only one X is drawn to meet the requirements of the question.
Step 2
The semilunar valves prevent blood flowing back into which part of the heart?
Answer
For part (b), the semilunar valves prevent blood from flowing back into the ventricles. Specifically, they ensure that once blood is pumped from the left ventricle into the aorta, or from the right ventricle into the pulmonary artery, it does not return back to the ventricles.