Respiratory System

The respiratory system’s main function is gas exchange, mainly carbon dioxide to oxygen via osmosis. It also enables speech and sound, and has an extensive defense system against pathogens.

Parts Involved

The first five parts listed below make up the conducting zone, and the last four make up the respiratory zone.

Fun Facts

Lined up end to end, the lungs’ airways would be about 1,490 miles (2,400 km) long.

The average person take 21,600 breaths per day.

70% of the body’s waste products leave through breath.

The brain uses 25% of the body’s oxygen and is only 2-3% of its mass.

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Skeletal System

Bones have two purposes. Some, like your backbone, provide the structure which enables you to stand erect instead of lying like a puddle on the floor. Other bones protect the delicate, and sometimes soft insides of your body.

Parts Involved


Fun Facts

You have over 230 movable and semi-movable joints in your body.

Humans and giraffes have the same number of neck bones; clearly they’re not the same length proportionally!

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Continued Anatomical Learning

Human Body & Mind - BBC Science & Nature

Human Anatomy Online

How Your Brain Works - How Stuff Works

How Sex Works - How Stuff Works

The Anatomy Coloring Book (book)

Content on this page came in part from Wikipedia article Human Anatomy and several articles accessed from links within. All Wikipedia materials are copylefted under the GNU Free Documentation License agreement.

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