Below is an illustration that was drawn by the hand of three of the many microscopic images of respiratory system body tissues. Their description and function are as follows:
• 𝕿𝖗𝖆𝖈𝖍𝖊𝖆. The trachea is a long tube that connects the larynx to the bronchi. The primary function of the trachea is to provide an air passage to your lungs for respiration. Also, along the trachea lining are sticky mucous linings that help trap foreign substances.
• 𝕰𝖕𝖎𝖌𝖑𝖔𝖙𝖙𝖎𝖘. The epiglottis is a flap of cartilage located in the throat behind the tongue and front of the larynx. The epiglottis is are usually upright, at rest, allowing the air to pass into the larynx and lungs. The main function of the epiglottis is to prevent food and drink from entering the windpipe.
• 𝕬𝖎𝖗 𝖘𝖆𝖈𝖘 𝖔𝖋 𝖙𝖍𝖊 𝕷𝖚𝖓𝖌𝖘. Tiny air sacs in the lungs are known as “alveoli.” These air sacs take up the oxygen you breathe and keep the body going. Alveoli are considered be the workhorses of the respiratory system. They expand to take in oxygen and shrink to expel carbon dioxide.

References:
Hecht, M. (2018, November 26). Alveoli: Function, structures, and Lung Health. Healthline. Retrieved April 25, 2022, from https://www.healthline.com/health/alveoli-function#:~:text=The%20Alveoli%20in%20Your%20Lungs&text=Alveoli%20are%20tiny%20air%20sacs,the%20end%20of%20bronchial%20tubes.

Respiratory system: Functions, facts, Organs & Anatomy. Cleveland Clinic. (2020, January 24). Retrieved April 25, 2022, from https://my.clevelandclinic.org/health/articles/21205-respiratory-system#:~:text=The%20respiratory%20system%20is%20the,waste%20gases%20like%20carbon%20dioxide.

U.S. National Library of Medicine. (2021, February 12). Epiglottis: Medlineplus medical encyclopedia image. MedlinePlus. Retrieved April 25, 2022, from https://medlineplus.gov/ency/imagepages/19595.htm