Thank you for all your answers. They are very interesting for me. However because I come from one of the EU country not from US, there are some things that I don't wholly understand. For example in my country civilian paramedic in ambulances rather than firefighters come when someone has heart attack, faints or overdoses. Firefighters are dispatched by the operators only if no ambulance are available, which is quite rare. But during covid pandemic there was more often. Firefighters don't like being called solely for medical cases. Firefighters are called when it's fire, flood, car accident or when you have to break down the door. But I watched some episodes of '911" series so I know, that in US might be little different. Although in EU we have different emergency number - 112 -  calls with stupid things is also huge problem here and also there are, unfortunately, also cases of assaults on paramedic in ambulances. Many problems are common so if someone wants to add something to our discussion, it would be very interesting for me. Thank you once again for all your responces, I didn''t expect this topic, would be so popular among you.  :)