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Figure 9 shows the structure and actual size of red blood cells (erythrocytes) - Edexcel - GCSE Biology - Question 5 - 2021 - Paper 1
Question 5
Figure 9 shows the structure and actual size of red blood cells (erythrocytes). (a) (i) Calculate the image size of the top view of this red blood cell if this cel... show full transcript
Worked Solution & Example Answer:Figure 9 shows the structure and actual size of red blood cells (erythrocytes) - Edexcel - GCSE Biology - Question 5 - 2021 - Paper 1
Step 1
Calculate the image size of the top view of this red blood cell if this cell is magnified 400×.
Answer
To find the image size, we can use the formula:
Here, the actual size of the top view of the red blood cell is 2.5 µm. Given that the magnification is 400×:
Now, to convert µm to mm:
Thus, the image size of the top view of the red blood cell is 1 mm.
Step 2
Explain how the shape of a red blood cell is related to its function.
Answer
The shape of a red blood cell (RBC) is a biconcave disc, which is crucial for its function in several ways:
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Increased Surface Area: The biconcave shape increases the surface area to volume ratio, enhancing oxygen and carbon dioxide exchange.
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Flexibility: This shape allows the RBCs to be flexible and easily maneuver through narrow capillaries, ensuring efficient oxygen delivery to tissues.
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Optimal Hemoglobin Packing: The disc shape allows for optimal packing of hemoglobin, maximizing the oxygen-carrying capacity of the blood.
Overall, the unique shape of red blood cells enables them to perform efficiently in transporting oxygen and maintaining proper gas exchange in the body.