Question

the graph represents a persons heart rate in beats per minute during 30 minutes of exercise. which statement best describes the relationship between heart rate and time during exercise? the heart rate increases for 6 minutes, remains constant for 19 minutes, and then gradually increases for 5 minutes. the heart rate decreases for 6 minutes, remains constant for 19 minutes, and then gradually increases for 5 minutes. the heart rate increases for 6 minutes, remains constant for 19 minutes, and then gradually decreases for 5 minutes. the heart rate remains constant for 6 minutes, increases for 19 minutes, and then gradually decreases for 5 minutes.

Explanation:

Step1: Analyze the graph's first segment

From time 0 to 6 minutes, the heart rate (y - axis) goes from 75 bpm to 135 bpm. So, it is increasing for 6 minutes.

Step2: Analyze the graph's second segment

From 6 to 25 minutes (6 + 19 = 25), the heart rate stays at 135 bpm. So, it remains constant for 19 minutes.

Step3: Analyze the graph's third segment

From 25 to 30 minutes (25+5 = 30), the heart rate goes from 135 bpm to 105 bpm. So, it is decreasing for 5 minutes.

Answer:

The heart rate increases for 6 minutes, remains constant for 19 minutes, and then gradually decreases for 5 minutes. (The third option among the given choices)