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? cardiac 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:

Analyze the graph's trend. The heart - rate line goes up in the first 6 minutes, stays horizontal (constant) from 6 - 25 minutes (19 minutes), and then goes down in the last 5 minutes.

Answer:

The heart rate increases for 6 minutes, remains constant for 19 minutes, and then gradually decreases for 5 minutes.