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.
A pseudostratified epithelium lines the respiratory bronchiole. The bronchiole has submucosal glands. In most species, blood is supplied to the alveoli by the bronchial artery. Without the bronchiolar cell, terminal bronchioles would become clogged with mucous and bronchitis would be prevalent. True b. False xx.