Four major cell types produce a physical and chemical barrier to infection of the airways, including ciliated cells, mucus-secreting goblet cells, and club cells, which produce antimicrobial compounds and basal cells which, along with club cells, serve as regional progenitor cells to replenish the other cell types
Mitochondria are considered as the powerhouse of cell because they perform function cellular respiration process in a cell.
Cellular respiration is a process of converting the chemical energy present in nutrients into ATP which gives energy to organisms to carry out movement and physical actions.
Mitochondria performs cellular respiration process from which they can release energy present in food and nutrients.
Due to those reasons, mitochondria is called as powerhouse of cell.
