A dome-shaped muscle found under the rib cage.  It assists during breathing by contracting when inhaling and expanding when exhaling.

Waste product of respiration that is expelled from the body when we exhale. It is given off during the gas exchange between air and blood in the alveoli. 

Provides oxygen to each of the cells of the body. It includes the parts of the body used for breathing.

Oxygen is needed by ALL cells in order to release energy from food.

Bronchi

(Plural for Bronchial Tube)

Two tubes that are divided from the trachea.  They carry air to each lung.

One delivers air to the left lung while the other delivers air to the right lung.

Flap of tissue at the top of the larynx. It prevents food from entering the windpipe by covering the larynx when food is being swallowed.

When vibrated, they produce sounds of voices.  They are contained in the larynx.

Tiny blood cells.  They line the alveoli.

The part of breathing when we bring air into our lungs. The chest cavity expands to allow room for the air to enter the lungs.

Needed by EVERY cell in the body.  It is removed from the air while in the lungs and is added to the blood through the capillaries of the alveoli. It then enters the heart to be pumped throughout the body.

It is used by the cells to release energy from food.

The part of breathing when we force the waste out of our lungs. The chest cavity contracts to push the waste products from the lungs.

Located at the bottom of the pharynx.  It contains the vocal chords.

It is also known as the "voice box".

Air enters the body here and is filtered, warmed, and moistened.

It is much better for your body to breathe in through here than through your mouth!

Alveoli

(Plural for Alveolus)

Tiny air sacs. 

The bronchi divide into smaller branches which contain MILLIONS of these!

Tube that begins at the bottom of the larynx.  It divides into smaller and smaller tubes as it enters and spreads throughout the lungs.

Also known as the "windpipe".

The area behind the nose that leads to the throat. Air passes from the nose to it before entering the larynx.