The human body
A heart, a breath, and a body that can run.
Your body is you. Your heart keeps a steady beat. Your lungs fill with air when you breathe in.
Bones help you stand and run. Skin keeps you warm. Hands can hold things. Feet can carry you across the grass.
The children in this picture are using their bodies to play. That is an ordinary, sunny day.
A little more
The human body is a person's own body. It is the living shape of a person.
From the Simple English Wikipedia summary of Human body. Kept short. This is not the whole article.
For a grown-up: this is a picture-book page. It is not medical advice, and it does not say what to do if someone feels unwell.
Practice words with pictures A different page, for language.