For our steam project we chose to cover Covid-19 and the effects on the respiratory system. We made a respiratory system using two straws, and two sandwich bags. The straws represent the nose, mouth and bronchioles leading to the lungs, represented by the sandwich bags. Covid-19 enters through the respiratory tract, into the mucus membrane where it starts to replicate itself. When the virus attaches to host cells, it begins to create new virus RNA. This replication causes inflammation and swelling of the respiratory tract. The virus next spreads into the bloodstream and this is when symptoms begin to onset. When a person is infected with Covid-19 and are showing serious symptoms, the alveoli’s in the lungs are inflamed. This inflammation makes it difficult for the alveoli to do their job, which is to exchange gases (oxygen and carbon dioxide). The main symptom is difficulty breathing and this is what is shown in our project. In our project, the right lung is a healthy one and the left is a lung infected with Covid-19. So, since the alveoli are inflamed and gas cannot be exchanged, when a person breathes their lungs are not fully inflating and oxygen is not being exchanged with carbon dioxide.