The Respiratory Syste3 - The Respiratory System Respiration...

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The Respiratory System Respiration includes the movement of air into and out of the lungs, the exchange of gases between the air and the blood, the transport of gases in the blood, and the exchange of gases between the blood and tissues. Functions of the Respiratory System The respiratory system exchanges oxygen and carbon dioxide between the air and blood, regulates blood pH, produces sounds, moves air over the sensory receptors that detect smell, and protects against some microorganisms. Anatomy of the Respiratory System Nose and Nasal Cavity The bridge of the nose is bone, and most of the external nose is cartilage. The nasal cavity warms, humidifies, and cleans the air. The external nares open to the outside, and the internal nares lead to the pharynx. The nasal cavity is divided by the nasal septum into right and left parts. The paranasal sinuses and the nasolacrimal duct open into the nasal cavity.
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