In real life, what is something that functions like the mitochondria?

What are the result of when individual components in an organism interact with others to create noval stucture and function called

The pharynx is the structure in the body that serves as a pathway of both air and food. how does the body make sure that food does not get into the lungs? the salivary glands secrete enzymes that pull food out of the air pathway. the small intestine pushes the air out of the digestive system. the pancreas breaks down food in the air pathway. the epiglottis closes the air pathway so that food will not enter it.

What is a dendrite and what does it do?