Question

Plan an investigation to examine how heart rate changes during and after an exercise is performed for two different periods of time. Time Approximately 60 minutes Question How does heart rate change during and after an exercise is performed for two different periods of time? Hypothesis In the space below, develop a hypothesis that will test the question. Summary In this experiment, you will work with a partner to measure each other’s heart rate before and after exercise. You will start by determining each other’s resting heart rate. Then, you will do an exercise for a specific amount of time, measure each other’s heart rate afterward, and then determine each other’s recovery period. You will then repeat this procedure with the same exercise but for a longer period of time. You will choose the type of exercise performed during the experiment as well as the two durations of time. You and your partner will recognize the feedback systems involved throughout the lab. In your conclusion, you will provide evidence from your lab of homeostasis and the feedback mechanisms needed to maintain stability. Safety ▪ Make sure that all behavior in the lab is purposeful. ▪ When exercising, wear gym shoes. ▪ Be respectful of others and their personal space as you perform your experiment. ▪ Report all accidents—no matter how big or small—to your teacher. Background Information Homeostasis is the tendency to keep the body in balance or to maintain a stable internal environment. The balance in the body is regulated by feedback mechanisms. There are two types of feedback mechanisms: positive feedback and negative feedback. Positive feedback mechanisms cause an additional change in the direction away from homeostasis, while negative feedback mechanisms cause a change in direction back toward homeostasis. Negative feedback mechanisms are more common than positive feedback mechanisms. In this lab, you are going to cause your resting heart rate to increase while you are exercising. As you start to exercise, your muscles start to deplete

Answer 1

During exercise, the heart rate increases to meet the increased demand for oxygen and nutrients. Initially, both the heart rate and stroke volume increase, leading to a higher cardiac output, but as the heart rate continues to rise, the stroke volume decreases. Monitoring heart rate during exercise is crucial for maintaining cardiovascular health.

Step-by-step explanation:

Effect of Exercise on Heart Rate

During exercise, the heart rate increases to meet the increased demand for oxygen and nutrients by the muscles. Initially, the heart rate and stroke volume both increase, leading to a higher cardiac output. However, as the heart rate continues to rise, the stroke volume decreases due to decreased filling time. Therefore, it is important to monitor heart rate during exercise to ensure it stays within the target range for maintaining a healthy cardiovascular system.