Standard Science Primary 5 Systems

The graph shows Ravi's heart rate over 20 minutes. At which point did he most likely finish his exercise and start resting?

A Point Y
B Point W
C Point Z
D Point X
Show Worked Solution

Worked Solution

Step 1: Exercise increases the heart's need to pump oxygenated blood faster. Step 2: Heart rate peaks during exercise. Step 3: Once exercise stops, the heart rate begins to drop back to resting level (Point X).

Correct answer: Point X

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