<unk> s are people who are specially trained to provide out-of-hospital care in medical<unk> es.  There are many different types of<unk> s, each with different levels of training, ranging from first aid and basic life support to advanced life support.  Terms may have different meanings with different training requirements in different countries.
Emergency medical responder
Trauma team
Hospital rapid response team
Poison control center
Trauma center
Pulmonary embolism support group
Aviation Medical Examiner
Medical laboratory assistant