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A student dissected an organ from a mammal to observe blood vessels - AQA - A-Level Biology - Question 4 - 2021 - Paper 1
Question 4
A student dissected an organ from a mammal to observe blood vessels. He dissected a slice of the organ and identified two blood vessels. Figure 4 shows a photograp... show full transcript
Worked Solution & Example Answer:A student dissected an organ from a mammal to observe blood vessels - AQA - A-Level Biology - Question 4 - 2021 - Paper 1
Step 1
Suggest two ways the student could improve the quality of his scientific drawing of the blood vessels in this dissection.
Answer
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The student should use single lines and ensure that lines are continuous and connected, avoiding sketching.
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The student can add labels, annotations, and a title to the drawing for clarity.
Step 2
Identify the type of blood vessel labelled as X and the type of blood vessel labelled as Y in Figure 4. Describe one feature that allowed you to identify the blood vessels.
Answer
Blood vessel X: Artery (arteriole)
Blood vessel Y: Vein (venule)
Feature: The difference in lumen size allows differentiation; arteries have a narrower lumen compared to veins.
Step 3
Describe two precautions the student should take when clearing away after the dissection.
Answer
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The student should carry and wash sharp instruments by holding the handle securely to prevent accidents.
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Disinfect instruments and surfaces after use to ensure cleanliness and prevent contamination.