What are some advantages of using a model for teaching about organs rather than using an actual organ

Interesting question, nadakhx!

So, by definition, a scientific model is a representation of something in the natural world. One advantage of using a scientific model is that it allows scientists to study things that may be too large, too small, or in some way to difficult to study. For instance, you might be studying an organ that is too small to observe all of its features, making it difficult for the instructor to teach students about that organ. If you were to use a model of the pineal gland, for example, it would make the teaching process a lot simpler, as the pineal gland typically measures around 7 x 6 x 3 mm in size. 

Hope this helps! : )

(I apologize for any grammatical errors in my response, by the way. I do not have the time to revise and edit it.)

They carry out the exchange of gases as we breathe ( oxygen and carbon dioxide).