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Glucose and urea are transported in the blood to nephrons - Edexcel - GCSE Biology - Question 2 - 2016 - Paper 1

Question 2

Glucose and urea are transported in the blood to nephrons. The diagram shows a nephron with the glucose and urea concentrations at locations labelled P, Q and R. (... show full transcript

Worked Solution & Example Answer:Glucose and urea are transported in the blood to nephrons - Edexcel - GCSE Biology - Question 2 - 2016 - Paper 1

Step 1

Calculate Initial and Final Glucose Concentrations

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Answer

At location P, the glucose concentration is 170 mg/100 cm³. At location Q, the glucose concentration is 80 mg/100 cm³.

Step 2

Determine the Decrease in Glucose Concentration

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Answer

The decrease in glucose concentration is calculated as follows:

Decrease = Initial Concentration - Final Concentration Decrease = 170 mg/100 cm³ - 80 mg/100 cm³ = 90 mg/100 cm³.

Step 3

Calculate the Percentage Decrease

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Answer

The percentage decrease in glucose concentration is calculated using the formula:

[ ext{Percentage Decrease} = \left( \frac{\text{Decrease}}{\text{Initial Concentration}} \right) \times 100 ]

Substituting the known values: [ ext{Percentage Decrease} = \left( \frac{90}{170} \right) \times 100 \approx 52.94% ]

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