![]() Most normal breathing takes place through the nasal cavity, but the oral cavity can be used to supplement or replace the nasal cavity’s functions when needed. The mouth, also known as the oral cavity, is the secondary external opening for the respiratory tract. Air exiting the body through the nose returns moisture and heat to the nasal cavity before being exhaled into the environment. Hairs and mucus lining the nasal cavity help to trap dust, mold, pollen and other environmental contaminants before they can reach the inner portions of the body. The function of the nasal cavity is to warm, moisturize, and filter air entering the body before it reaches the lungs. The nasal cavity is a hollow space within the nose and skull that is lined with hairs and mucus membrane. ![]() The nose is a structure of the face made of cartilage, bone, muscle, and skin that supports and protects the anterior portion of the nasal cavity. The nose and nasal cavity form the main external opening for the respiratory system and are the first section of the body’s airway-the respiratory tract through which air moves. Anatomy of the Respiratory System Nose and Nasal Cavity ![]() Finally, the muscles of respiration, including the diaphragm and intercostal muscles, work together to act as a pump, pushing air into and out of the lungs during breathing. Act as the functional units of the respiratory system by passing oxygen into the body and carbon dioxide out of the body. ![]()
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