Question

case file
chemical name: propanal
common uses: this chemical is used to manufacture plastic and rubber. this chemical is also used as a disinfectant and preservative. this chemical is a fire and explosion hazard.
health effects: inhaling this chemical can irritate the nose and throat, cause coughing and shortness of breath. this chemical can also create a build up of fluid within the lungs.
warning
chemical has been detected
to synchronize the lasers and target the correct chemical, answer the following question: which part of the body is most affected by this chemical?
this chemical is safe
the nervous system
the circulatory system
the respiratory system

Explanation:

The health - effect description states that inhaling propanal can irritate the nose and throat, cause coughing and shortness of breath, and build up fluid in the lungs, which are all related to the respiratory system.

Answer:

The respiratory system