👉 Cercomonas is a type of tissue that forms in the nasal cavity and helps to protect the inner lining of the nose from foreign particles. It's composed of two types of cells, the alveolar epithelial cells (E) and the amniotic epithelial cells (A). E are responsible for secreting mucus, while A is responsible for producing collagen, which provides structural support to the nasal cavity. Cercomonas is a key part of the immune system in the