| |
|
Human Body: Heart and Lungs
|
|
| |
| Your Heart at Work |
| |
| | Your heart is a muscle that works all the time. |
| | Blood vessels are tubes that carry blood from your heart to the rest of your body and back to your heart. |
| | Your pulse tells you every time your heart beats. |
| | Most animals have a pulse. |
| | Charts and graphs can make ideas easy to understand. |
| | Blood flows through your body. Blood carries the nutrients, or foods, and oxygen your body needs. |
