Paramedics need to be experts on the human body and it's functions; so in order to know about the body they'd need to study science and take it at school. As a paramedic myself, I've studied textbook after textbook and could tell you anything you wish to know from your pulse to your anatomy systems, to your blood cells.
If you wish to become a Paramedic, I suggest you study the "Ross and Wilson: Anatomy and Physiology" textbooks, they're available on Amazon.co.uk priced at around £30.00.
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You gotta know the human anatomy as college level, you have to basically be a doctor and determine what is wrong by asking questions and reading a monitor that you hook to the patient usually, you must also know how and which drugs to use in the case of needing them and what to do in emergencies, you also need to know how much to give and if you need to dilute them at all. Basically it takes a long time of constant study to become a good paramedic.
It all depends on the type of pt. that they are treating. All Pt. care will require a knowledge in Anatomy/Physiology, and sometimes pharmacology