The heart is an organ that pumps blood throughout the circulatory system in the body. Red blood cells are a tissue in the body that carry nutrients to the body's cells and waste away from the body's cells. The heart rate increases or decreases depending on the body's needs to transport nutrients and waste.
In an experiment, a female had her heart monitored. For one minute, she sat in a chair quietly. At the end of the first minute to the end of the third minute she did jumping jacks. Finally, she sat again in the chair and waited until her heart rate went back to her resting heart rate as measured in the first minute. After performing this experiment, the following graph was created.
Using the data in Graph 1, what will the heart rate be in the 8th minute if the person continued to rest?
- The heart rate will be above the initial resting heart rate.
- The heart rate will be at about the same as the initial resting heart rate.
- The heart rate will be below the initial resting heart rate.
- The heart rate will be falling at a faster rate than during the resting period after exercise.
Answer(s): B
Explanation:
As seen in Graph 1, the heart rate decreased until it returned to the initial resting heart rate. Because the participant was continuing to rest, the heart rate would reflect that of a resting period.