Did you know?

There are many human devices that are designed to imitate skeletal system, for exampel helicopter. Helicopter imitates dragonfly. Dragonfly's wings can move up and down.

Science Focus. 2009. Science for elementary school year IV. Bogor: Yudhistira.

Resumed by: Danar Kusuma

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Lungs

Lungs is located inside the chest cavity (thorax). Inside the lungs, bronchioles branch into smaller and smooter branches. These smooth branches form a sac at its end called alveolus. Inside the alveolus occurs oxygen and carbon dioxide exchange.
(Source: Science Focus.2009. Science for elementary school Va.Bogor: Yudhistira) .