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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 blood vessel's structure plays a crucial role in its function.
Firstly, the presence of a smooth endothelial lining reduces friction, which facilitates smooth blood flow. This is essential for maintaining efficient circulation.
Secondly, if it is an artery, the thick muscular wall allows the vessel to withstand and regulate high levels of blood pressure, allowing it to transport blood away from the heart effectively. In contrast, if it is a vein, its thinner walls and larger lumen accommodate the lower pressure of blood returning to the heart.
Lastly, elastic fibers within the vessel wall enable it to stretch and rebound with each heartbeat, ensuring continuous blood movement.