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 13 minutes, and then gradually increases for 5 minutes. the heart rate decreases for 6 minutes, remains constant for 13 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 increasing - part

From the start (0 minutes) to 6 minutes, the heart - rate line is going up, so the heart rate is increasing for 6 minutes.

Step2: Analyze the graph's constant - part

From 6 minutes to 19 minutes, the heart - rate line is horizontal, so the heart rate remains constant for 19 - 6=13 minutes.

Step3: Analyze the graph's decreasing - part

From 19 minutes to 24 minutes, the heart - rate line is going down, so the heart rate decreases for 24 - 19 = 5 minutes.

Answer:

The heart rate increases for 6 minutes, remains constant for 13 minutes, and then gradually decreases for 5 minutes.