Reading · Grade 5
The Amazing Human Heart
Name Date Score
Your heart is a powerful muscle about the size of your fist, and it never takes a break. Its job is to pump blood to every part of your body. The blood carries oxygen and nutrients that your cells need to live and work. With each beat, the heart squeezes and pushes blood through tubes called blood vessels. A child's heart beats around 90 times every minute — that is more than 100,000 beats a day. When you run and play, your heart beats faster to give your muscles the extra oxygen they need.
About what size is the human heart?
What is the heart’s main job?
What does blood carry to your cells?
What are the tubes that carry blood called?
Why does your heart beat faster when you run?
Answer Key
- About the size of your fist.
- To pump blood around the body.
- Oxygen and nutrients.
- Blood vessels.
- To give your muscles more oxygen.