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Ventilation refers to the flow of air into and out of the alveoli.

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The airway that leads from the larynx (voice box) to the bronchi (large airways that lead to the lungs).

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Your sinuses are four paired cavities (spaces) in your head. Narrow passages connect them. Sinuses make mucus that drains out of the passages in your nose.

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The respiratory system is a biological system consisting of specific organs and structures used for gas exchange in animals and plants. The anatomy and physiology that make this happen varies greatly, depending on the size of the organism, the environment in which it lives and its evolutionary history.

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The movement of oxygen from the outside environment to the cells within tissues, and the removal of carbon dioxide in the opposite direction that's to the environment.

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A thin layer of tissue that covers the lungs and lines the interior wall of the chest cavity. It protects and cushions the lungs. This tissue secretes a small amount of fluid that acts as a lubricant, allowing the lungs to move smoothly in the chest cavity while breathing.

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Throat, lies directly behind the nasal cavities.

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The nose has two openings, called nostrils or nares, through which air enters.

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A wall of cartilage.

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The nasal cavities are two hollow spaces.

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The divisions of the bronchi and the alveoli are found in organs called lungs.

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The larynx, or voice box, lies between the pharynx and trachea. It has nine layers of cartilage, is commonly called the Adam's Apple. The larynx contains two folds, called vocal cords.

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Internal Respiration is the exchange of carbon dioxide and oxygen between the tissue cells and the bloodstream.

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Inspiration (inhalation) is the process of breathing in air.

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External Respiration is the exchange of oxygen and carbon dioxide between the lungs and bloodstream.

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When the diaphragm and intercostal muscles relax, the process of expiration (exhalation) occurs.

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The epiglottis, a special leaflike piece of cartilage, closes the opening into the larynx during swallowing. This prevents food and liquids from entering the respiratory tract.

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Tiny, hair-like structures, called cilia, filter inhaled air to trap dust and other particles. The cilia then help move the mucous layer that lines the airways to push trapped particles toward the esophagus, where they can be swallowed.

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The cells then use the oxygen and nutrients to produce energy, water and carbon dioxide.

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In the lungs, the bronchi continue to divide into the smallest branches, called bronchioles.

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The trachea divides into two bronchi near the center of the chest, a right bronchus and a left bronchus.

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The alveoli resemble a bunch of grapes. An adult lung contains approximately 500 million alveoli. They are made of one layer of squamous epithelial tissue and contain a rich network of blood capillaries.