HMS, BM EQ-Bank 359 MC

During research on aerobic training responses, a student collected the following data:

\begin{array}{|c|c|c|c|}
\hline \textbf{Time} & \textbf{Heart Rate} & \textbf{Cardiac Output} & \textbf{Stroke Volume} \\
\textbf{(minutes)} & \textbf{(bpm)} & \textbf{(L/min)} & \textbf{(mL)} \\
\hline 0 \text{ (at rest)} & 70 & 5.6 & 80 \\
\hline 5 & 120 & 12.0 & 100 \\
\hline 10 & 140 & 16.8 & \textbf{?} \\
\hline \end{array}

What is the stroke volume at 10 minutes?

95 mL
112 mL
120 mL
140 mL

Show Answers Only

\(C\)

Show Worked Solution

Consider Option C: 120 mL

\(\text{Cardiac Output}\)	\(=\text{Heart Rate}\times\text{Stroke Volume}\)
\(\text{Stroke Volume}\)	\(\ =\text{ Cardiac Output ÷ Heart Rate}\)
	\(=16.8\ \text{L/min ÷}\ 140\ \text{bpm}\)
	\(=0.12\ \text{L}\ =120\ \text{mL}\)

Other Options:

A is incorrect: This value is incorrect based on the cardiac output formula.
B is incorrect: This value is incorrect based on the cardiac output formula.
D is incorrect: This equals the heart rate, not the stroke volume.

\(\Rightarrow C\)