Olfactory epithelium b. All of the above x. All of the above x. All of the above x. When giving a gaseous anesthesia, the gas in its normal route of entry must pass through several barriers before it enters the blood.
Smooth muscle is very important in the respiratory system.
The relaxation and contraction of smooth muscle within the respiratory system is an important contribution to the physiology of air movement. Olfactory reception is essential in many domestic and feral animals for reproductive behavior, identification of food, etc. I am a small cell with large nucleus, have an apical cytoplasm that secretes a serous solutions by merocrine secretion containing proteolytic enzymes, and have increased amounts of smooth endoplasmic reticulum. My function is to prevent mucous from clogging the small airways. Mucous cells are numerous in the trachea.