Final answer:
The authority for an EMT to render care usually comes from the medical director or a base hospital.
Step-by-step explanation:
The authority for an EMT to render care usually comes from the medical director. The medical director is a medical doctor who provides guidance and oversight to the paramedics and EMTs. They ensure that the medical protocols and standards are followed and may also be involved in training and education of the EMTs.
In some cases, the authority to render care may also come from a base hospital. A base hospital is a designated healthcare facility that provides medical direction and support to the EMS system. The base hospital may have specific protocols and guidelines that the EMTs must follow.