When you exercise, your muscles need more energy. To get that energy, they need more oxygen. Your heart is responsible for pumping blood, which carries oxygen, throughout your body. So, when you exercise, your heart beats faster to deliver more oxygen-rich blood to your muscles. This increased heart rate also helps to carry away waste products, like carbon dioxide, that your muscles produce during exercise.
Think of it like this: your heart is the delivery truck, oxygen is the package, and your muscles are the customer. When demand goes up (exercise), the delivery truck needs to make more trips (faster heart rate) to keep everyone happy!
Match the terms with their definitions:
| Term | Definition |
|---|---|
| 1. Heart Rate | A. The process of taking in oxygen and releasing carbon dioxide. |
| 2. Oxygen | B. The number of times your heart beats per minute. |
| 3. Carbon Dioxide | C. A gas that your body needs to function. |
| 4. Muscles | D. A waste gas produced by your body. |
| 5. Respiration | E. Tissues that contract to produce movement. |
Your heart beats faster during exercise to supply more ______ to your ______. This increased blood flow also helps remove ______ ______. The rate at which your heart beats is called your ______ ______. This all helps maintain ______ levels during physical activity.
Why is it important for your heart rate to return to normal after you finish exercising?
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