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Figure 2 shows a photomicrograph of a blood vessel - Edexcel - GCSE Biology Combined Science - Question 2 - 2016 - Paper 1
Question 2
Figure 2 shows a photomicrograph of a blood vessel. (b) Explain how the structure of this blood vessel is related to its function.
Worked Solution & Example Answer:Figure 2 shows a photomicrograph of a blood vessel - Edexcel - GCSE Biology Combined Science - Question 2 - 2016 - Paper 1
Step 1
Explain how the structure of this blood vessel is related to its function.
Answer
The structure of a blood vessel is crucial for its function in transporting blood efficiently.
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Elasticity: The walls of arteries contain elastic fibers that allow them to stretch and recoil. This elasticity helps to maintain blood pressure as blood is pumped by the heart, enabling smooth blood flow.
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Muscle Layer: Arteries have a thick muscular layer that allows them to constrict and dilate. This regulates blood flow and pressure in response to the body’s demands, ensuring that various tissues receive the appropriate blood supply.
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Lumen Size: The narrow lumen of an artery helps maintain high blood pressure, which is necessary for effective blood circulation.
By having these specialized structural features, blood vessels can effectively transport blood throughout the body, adapt to varying demands, and maintain essential physiological functions.