Major airways of the lungs that diverge from the windpipe.

Are when the bronchi continue to divide into smaller and smaller bronchi until they divided into the smallest branch.

A process that gives the cell oxygen so it can use the oxygen and nutrients to produce energy, water, and carbon dioxide.

A tiny, hairlike structures that filter inhaled air to trap dust and other particles.

A special leaflike piece of cartilage and closes the opening into the larynx during swallowing.

When the diaphragm and intercostal muscles relax, the process occurs.

The exchange of oxygen and carbon dioxide between the lungs and bloodstream.

The process of breathing in air.

The exchange of carbon dioxide and oxygen between the tissue cells and the bloodstream.

The voice box lies between the pharynx and trachea.

The divisions of the bronchi and alveoli are found in this organ.

Are two hollow spaces. They are lined with a mucous membrane and have a rich blood supply.

A wall of cartilage that divides the nose into two hollow spaces.

Has two openings, called nostrils or nares, through which air enters.

Lies directly behind the nasal cavities.

What encloses the lungs in a membrane, or sac.

The process of inspiration and expiration.

Consists of the lungs and air passages. This system is responsible for taking in oxygen, a gas needed by all body cells, and removing carbon dioxide.

Cavities in the skull that surround the nasal area.

A tube extending from the larynx to the center of the chest. It carries air between the pharynx and the bronchi.

The process of breathing.