Answer the questions. 1. How big is your heart? 2. Why does the left side of the heart work harder than the right side? 3. Why does the heart beat faster when you are exercising? 33

1. **How big is your heart?** - Your heart is about the size of your fist, weighing around 250 to 350 grams. 2. **Why does the left side of the heart work harder than the right side?** - The left side pumps blood to the entire body, requiring more force, while the right side pumps blood to the lungs, which are closer and require less pressure. 3. **Why does the heart beat faster when you are exercising?** - Your heart speeds up to pump more blood and oxygen to your muscles during physical activity.