Final answer:
A full-face mask forms a complete seal with the face, covering the nose, mouth, and eyes, to protect the wearer. Terms like external respiration and pulmonary ventilation describe different aspects of breathing, and proper respiratory inlet coverings are crucial for lung protection.
Step-by-step explanation:
A respiratory inlet covering that forms a complete seal with the face is known as a full-face mask. This type of personal protective equipment covers both the nose and mouth, as well as the eyes, providing a comprehensive seal to protect the wearer from inhaling harmful substances. For example, Figure 4.13 illustrates a typical CPAP device used in the treatment of sleep apnea, which includes a mask affixed to the head with straps covering the nose and mouth to ensure a tight seal. This is different from a Nomex hood, which is used by firefighters over their face mask to protect the head from intense heat but does not itself form a complete seal with the face.
When it comes to the physiology of breathing, terms like external respiration, interpulmonary respiration, internal respiration, and pulmonary ventilation are used to describe different aspects of the respiratory process. These terms signify the exchange of gases between the atmosphere and the lungs, within the lungs themselves, between the blood and the body's tissues, and the mechanical flow of air into and out of the lungs, respectively.
In addition, devices such as full-face masks are important for ensuring that air is adequately warmed and humidified to prevent damage to the lungs. This is vital as the nasal passages play a key role in filtering and preparing air before it reaches deeper areas of the respiratory system.