Question

Question #c59c4

Answer 1

Cilium (pleural: cilia)

Explanation:

Many epithelial cells of animals have small, hair-like projections on their membranes, these are called cilia. There are two different types of cilia:

• motile cilia
• non-motile cilia

Motile cilia
These small moving structures usually display a rhythmic waving motion. Cells with motile cilia can be found in:

• respiratory tract and lungs : keeps the airways clear of foreign particles and mucus
• middle ear: convert stimuli into electric stimuli for hearing

Non-motile cilia
These are also called 'primary cilia' and have a function in sensing the environment. Cells wit non-motile cilia can be found in:

• kidney: the cilia bend with the flow of urine alerting the cells that there is urine to process.
• eye: the cilia function as a road to transport important molecules in light-sensing cells.