Structure, Function, and Practice

The ______ is the body's breathing system.

• cardiovasuclar system

• respiratory system

_______, breathing or exchanging air between the body and the outside environment, is accomplished within the structures of the respiratory system. In this type of respiration, air from the atmosphere is inhaled and, later, carbon dioxide is exhaled.

• external respiration

• internal respiration

Another type of respiration, ________, the bringing of oxygen to the cells and removing carbon dioxide from them, happens in the circulation of blood throughout the body. The carbon dioxide is removed from the body during exhalation.

• external respiration

• internal respiration

The respiratory system includes the _______ (organs where oxygenation of blood takes place), the ________ (passageways through which air moves in and out of the lungs), and the muscles that moves air into and out of the lungs.

• lungs

• respiratory tract

• nose

_______ (breathing in or ________) brings air from the outside environment into the ______ or mouth.

• inspiration

• inhalation

• nose

• nostrils

The nose has three functions: to warm, filter, and moisten the air. The _______ (also called ________) are the two external openings at the base of the external portion of the nose.

• nostrils

• external nares

• nasal septum

• nasal cavity

The external nose is supported by the nasal bones and is divided into the two halves by the _______, a strip of cartilage.

• nasal septum

• nasal cavity

• cilia

After air enters the nose, it passes into the _______, where it is warmed by blood in the muscous membranes that line these areas.

• nasal septum

• nasal cavity

_______ (hairs) in the nasal cavity filter out foreign bodies.

• nasal cavity

• cilia

Next, the air reaches the _______ (________), which is a passageway for both air and food.

• pharynx

• throat

• nasopharynx