Figure 6 shows a cross section of an artery and a vein - Edexcel - GCSE Biology - Question 4 - 2019 - Paper 1
Question 4
Figure 6 shows a cross section of an artery and a vein.
(i) Measure the length of line A and the length of line B in mm.
line A __________________ mm
line B ______... show full transcript
Worked Solution & Example Answer:Figure 6 shows a cross section of an artery and a vein - Edexcel - GCSE Biology - Question 4 - 2019 - Paper 1
Step 1
Measure the length of line A and the length of line B in mm.
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Answer
Line A is measured to be 8 mm.
Line B is measured to be 4 mm.
Step 2
State the ratio of the thickness of the artery wall to the thickness of the vein wall.
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Answer
The ratio of the thickness of the artery wall to the vein wall is 2:1, or equivalently 8:4.
Step 3
Give a reason why veins have valves.
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Answer
Veins have valves to prevent the backflow of blood, ensuring that it flows in one direction towards the heart.
Step 4
Name the artery that transports oxygenated blood from the heart to the body.
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Answer
The artery that transports oxygenated blood from the heart to the body is the aorta.
