Your heart is an organ. It pumps blood all around your body. It is about the size of your fist.
The heart has four chambers. Two of them are upper and two are lower.
Red blood cells carry oxygen from your lungs. They take it to the rest of your body.
When you swallow, a small flap covers your windpipe. This flap is called the epiglottis.
The nutrients from your food pass into your blood. This happens in the small intestine.
Your skeleton gives your body its shape and support.
Muscles help your body move.
The pupil is the opening in your eye. It lets light in. Your eyes turn light into signals. These go to your brain.
Skin is the biggest organ of your body. The liver is the largest organ inside your body.
Each kidney is about as big as a fist.
A human brain weighs about 3 pounds.
Words to know
- organ: body part
- pupil: eye opening
- liver: inside organ
- signals: messages
