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Exercise causes changes in the circulation of the blood - Edexcel - GCSE Biology - Question 9 - 2021 - Paper 1
Question 9
Exercise causes changes in the circulation of the blood. In an investigation, the change in blood flow to different parts of the body during exercise was measured. ... show full transcript
Worked Solution & Example Answer:Exercise causes changes in the circulation of the blood - Edexcel - GCSE Biology - Question 9 - 2021 - Paper 1
Step 1
Calculate the percentage change in blood flow to the stomach
Answer
To calculate the percentage change in blood flow to the stomach in response to exercise, we first need the values of blood flow at rest and during exercise.
From Figure 13:
- Blood flow to the stomach at rest: 500 cm³/min
- Blood flow to the stomach during exercise: 1000 cm³/min
Next, we use the formula for percentage change:
ext{Percentage Change} = rac{ ext{New Value} - ext{Original Value}}{ ext{Original Value}} imes 100Substituting in the values:
ext{Percentage Change} = rac{1000 - 500}{500} imes 100 = rac{500}{500} imes 100 = 100\Thus, the percentage change in blood flow to the stomach in response to exercise is 100%.