A-Level Edexcel Biology Solving Algebraic Equations

Review A-Level Edexcel Biology solving algebraic equations through cardiac-output calculations that compare resting heart rates from table data.

Exam points

solve cardiac-output equations to compare heart rates with units and decimal places

[Maximum number: 3]

Many people swim as part of their regular exercise.

Regular swimming affects resting heart rate and cardiac output.

\text { cardiac output }=\text { stroke volume × heart rate }

The table shows the mean resting cardiac output and mean resting stroke volume for a group of regular swimmers and a control group.

Table for Question A.2.4—Solving algebraic equations question 1 — Edexcel A-Level Biology A2

Using the data in the table, calculate the difference in resting heart rate between these two groups.

Give your answer to 2 decimal places with appropriate units.

An answer showing the following steps:

- calculation of heart rates (1)

- calculation of change in heart rate (1)

- correct number of decimal places and units (1)

ECF for mp1 correct calculation in $\mathrm{cm}^{3}$
Example of calculation:
$4.43 \div 0.0744=59.543$ $4.21 \div 0.0584=72.089$
72.1-59.5=12.546
ECF mp2 subtraction ( from mp1) and
correct number of d.p
Answer= $12.55(\mathrm{~b}) \mathrm{pm}$
Correct answer with units - 3 marks

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A.2.4—Solving algebraic equations question 1