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Warms, moistens, and filters air as it is inhaled.

Passageway for air and food, aids in sound production.

Houses the vocal cords, and is responsible for sound production.

Provides air flow to and from the lungs.

Two main branches off the trachea that lead to each lung, conducting air into the lungs.

Smaller branches off the bronchi that lead to alveoli.

Tiny sacs within the lungs where gas exchange occurs.

Main muscle of respiration that contracts and flattens to increase thoracic volume and draw air into the lungs.

Pair of organs that house the bronchi, bronchioles, and alveoli; responsible for gas exchange with the blood.

Membrane surrounding the lungs and lining the chest cavity, reducing friction during breathing movements.

Bony structure providing protection to the thoracic organs and support to the upper body. Also assists in respiration.

Muscles located between the ribs that assist with breathing by expanding and contracting the rib cage.

A flap of cartilage that covers the trachea during swallowing to prevent food from entering the airways.

Located within and posterior to the nose, the nasal cavity conditions the air to be received by the other areas of the respiratory tract.

Air-filled spaces in the skull that help humidify and heat inhaled air, and give resonance to the voice.

Muscular bands within the larynx that vibrate to produce sound when air passes over them.

A ridge at the base of the trachea where it splits into two bronchi, it is sensitive to irritation and can induce coughing.

Carry deoxygenated blood from the heart to the lungs.

Carry oxygenated blood from the lungs back to the heart.

Tiny blood vessels surrounding the alveoli where oxygen and carbon dioxide are exchanged between the air and the blood.

Regulates involuntary respiratory and cardiovascular functions.

Detect changes in blood pH, carbon dioxide, and oxygen levels, and help regulate breathing rate.

A substance that reduces surface tension within the alveoli, preventing their collapse during exhalation.

The part of the body cavity situated between the neck and the diaphragm; contains the lungs and heart.