Heart and Exercise Review ICM

Why does your heart rate go up during exercise?

• Because you need more oxygen.

• Because you are eating.

Answer explanation

Your heart rate increases during exercise because your muscles require more oxygen to produce energy. The body responds by pumping more blood, which raises the heart rate to meet this demand.

After a long run in the park, what happens to Michael's heart rate?

• It stays the same.

• It slows down.

Answer explanation

After a long run, Michael's heart rate increases during exercise but will gradually slow down as he recovers. Therefore, the correct answer is that it slows down.

When does your body not need as much oxygen?

• When you are eating

• After you stop exercising

Answer explanation

After you stop exercising, your body's demand for oxygen decreases as it no longer requires the increased energy output associated with physical activity. In contrast, during eating, oxygen needs remain relatively stable.

After a gym class, Charlotte wants to check if her body has returned to normal. What should she compare?

• Her weight

• Her resting heart rate and post-exercise heart rate

Answer explanation

To check if her body has returned to normal, Charlotte should compare her resting heart rate and post-exercise heart rate. These metrics indicate how quickly her body recovers after exercise, unlike weight, which is less relevant.

Tags

NGSS.HS-LS1-3

During a school sports day, what happens to David's heart rate when he participates in a race?

• It stops

• It increases

Answer explanation

During physical activity like a race, the body requires more oxygen, leading to an increase in heart rate to pump more blood. Therefore, David's heart rate increases when he participates in the race.

After a gym session, Daniel wants to know if his body is in homeostasis. What is one way he can measure this?

• By checking his temperature

• By checking his heart rate

Answer explanation

Checking heart rate is a direct indicator of how well the body is maintaining homeostasis after exercise, as it reflects the body's response to physical activity. Temperature can vary but is less specific for homeostasis.

Tags

NGSS.HS-LS1-3

Why is it important for your body to return to normal after exercising?

• To stay tired

• To maintain energy balance

Answer explanation

Returning to normal after exercising is crucial to maintain energy balance. This process helps replenish energy stores and supports recovery, ensuring the body can function optimally for future activities.

David wants to understand the effect of exercise on his heart rate. What should he do?

• Record his weight

• Record his heart rate before, during, and after exercise

Answer explanation

To understand the effect of exercise on heart rate, David should record his heart rate before, during, and after exercise. This will provide direct data on how exercise impacts his heart rate over time.

Tags

NGSS.MS-PS3-5