Oct 10, 2025 · Human respiratory system, the system in humans that takes up oxygen and expels carbon dioxide. The major organs of the respiratory system include the nose, pharynx, larynx, …

The upper airway system comprises the nasal cavity, sinuses, and pharynx; the lower airway system consists of the larynx, trachea, bronchi, bronchioles, and alveolar ducts. The blood and …

Subscriber features Email (Subscriber Feature) Cite (Subscriber Feature) Explore the human respiratory system with this interactive diagram. © Encyclopædia Britannica, Inc. × E-mail

Each of the major systems of the body is essential to the survival of the human organism, and each serves as a critical companion to the others. The muscle and skeletal systems, for …

The Human Respiratory System The human respiratory system includes several parts: nasal cavity, throat, voice box, windpipe, bronchi, and lungs. Air enters this system through the nose. …

Oct 10, 2025 · In addition to respiratory activities, the lungs perform other bodily functions. Through them, water, alcohol, and pharmacologic agents can be absorbed and excreted.

Oct 10, 2025 · Respiratory gases move between the environment and the respiring tissues by two principal mechanisms, convection and diffusion. Convection, or mass flow, is responsible for …

Sep 24, 2025 · The respiratory system, composed of the breathing passages, lungs, and muscles of respiration, obtains from the air the oxygen necessary for cellular metabolism; it also returns …

The lower airway system consists of the larynx, the trachea, the stem bronchi, and all the airways ramifying intensively within the lungs, such as the intrapulmonary bronchi, the bronchioles, and …

The trachea serves as passage for air, moistens and warms it while it passes into the lungs, and protects the respiratory surface from an accumulation of foreign particles. The trachea is lined …