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Epiglottis

A cartilaginous lid that closes over the larynx when swallowing.

Pharynx

The throat; canal between the mouth and the esophagus.

Trachea

A cartilaginous tube between the larynx and the main bronchus of the respiratory tree.

Alveoli

Microscopic air sacs in the lung.

Lungs

The organ of respiration located within the thoracic cavity.

Bronchi

The primary divisions of the trachea.

Sinuses

Produces mucus for the nasal cavities, makes bones of the skull lighter, and aids in sound production.

Nose

Exchanges air during inhaling and exhaling; warms, moisturizes, and filters inhaled air.

Upper Respiratory Infection (URI)

Inflammatory process involving the nose and throat; may include sinuses and refers to symptoms associated with the common cold.

Spirometer

Measures the volume of inhaled and exhaled air.

Pulmonary Emboli

A blockage in the pulmonary artery or one of its branches.

Pneumothorax

A collection of air or gas in the pleural cavity that displaces lung tissue.

Pneumonia

Inflammation of the lung caused primarily by microbes, chemical irritants, vegetable dust, or allergy.

Pulmonary

Involving the lungs.

Pleura

A serous membrane that covers the lungs and lines the thoracic cavity.

Oxygen (O2)

A colorless, odorless, tasteless gas found in the air.

Surfactant

A fatty molecule on the respiratory membranes.

Hypoxia

Lack of oxygen.

Cyanosis

A bluish discoloration of the skin caused by lack of oxygen.

Dyspnea

Difficult or labored breathing.

Asthma

An allergic reaction to a substance resulting in wheezing, shortness of breath, and difficulty in breathing.

Apnea

The absence of breathing.

Respiratory Expiration

Breathing out air.

Tuberculosis

Inflammatory disease of the lungs that destroys lung tissues caused by tubercle bacillus.