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

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

Smaller branches off the bronchi that lead to alveoli.

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

Passageway for air and food, aids in sound production.

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

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

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

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

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 oxygenated blood from the lungs back to the heart.

Provides air flow to and from the lungs.

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

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

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

Carry deoxygenated blood from the heart to the lungs.

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

Regulates involuntary respiratory and cardiovascular functions.

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

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

Tiny sacs within the lungs where gas exchange occurs.

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

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