Final answer:
The hairs within the nasal cavity that filter coarse particles from inspired air are called cilia. Cilia, along with mucus produced by the mucous membranes, form an essential part of the body's respiratory protective mechanisms by trapping harmful particles.
Step-by-step explanation:
Protective Mechanisms in the Nasal Cavity
The hairs within the nasal cavity that filter coarse particles, such as pollen and dust, from inspired air are known as cilia. These cilia are microscopic, hair-like projections that line the nasal passages and the rest of the respiratory tract. They play a critical role in the body's protective mechanisms by trapping and removing dust, germs, and other foreign particles to protect the lungs. The nasal cavity is also lined with mucous membranes that produce mucus to further trap particulates. Together, the mucous and cilia work to keep the air entering the respiratory system clean and free from harmful substances that can cause damage or trigger allergic responses.
Additionally, in the anterior portion of the nasal cavities, sebaceous glands and hair follicles are present to prevent the passage of large debris. The combined efforts of hairs, mucus, and cilia ensure that the air we breathe is warmed, moistened, and cleaned before it reaches the more sensitive areas of the respiratory system, such as the lungs.