To analyze how the graph demonstrates homeostasis, we can observe the trends in heart rates during the different phases of exercise for the two girls. Before the exercise, both girls exhibit resting heart rates around 70 beats per minute, indicating a stable state in their body when at rest. During the exercise, there is a noticeable increase in heart rates, with values reaching around 160 beats per minute, which reflects the body’s immediate response to physical activity in order to supply more oxygen to the muscles. After the exercise, the heart rates gradually decrease back to baseline levels, showing that the body effectively returns to its resting state, demonstrating the regulatory mechanisms of homeostasis in maintaining stable internal conditions despite external changes.
Two girls on a track team recorded their heart rates before, during and after a short exercise.
Use the graph below and what you know about the human body and homeostasis to answer the questions that follow.
Explain how the graph demonstrates homeostasis with at least 3 sentences. Be sure to include specific data from the graph.
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