Im a NP who is now in medical school. I went to a NP program that didnt' requrie a BSN first, so we did a little bit of RN stuff (just barely enough to qualify to take the NCLEX)
Yes, in a way NP takes care of more medical stuff. Most probably work in clinic/office setting, but there are increasing opportunities in more specialized settings. Take, for example, a family practice office. If you were to watch the activities of the NP and the MD working there, you would be unable to tell the difference. The NP sees the patient, takes a history, does an exam, makes a diagnoses and prescribes treatment, including writing prescriptions for meds. (whereas the RN in the office would take the vitals, put the pt in the room and give injections)
Differences..NP aren't trained to handle the scope of diseases that MD are. Generally NP must be "supervised" in some way by MD...what this means in acutal practice varies from state to state. The charts often must be cosigned by the MD. And one minor, but very annoying, aspect is that any tests, xrays, you order or referals you make go out under the MD's name (so in some ways the NP doesn't seem to exist)
Generally, NP aren't expected to do traditional things that RN do working on a hospital floor (IV, give meds, etc) However, you must be careful becuase in some settings the view is that a NP is like having a nurse and a doctor in one for a very cheap price, like a job I had in a rural setting. I never had a nurse in my clinic (run by a hosptial) and was expected to do all the nursing stuff as well as manage the medical issues.
However, where I go to medical school, NP's work in very specialized settings. THere are several that work in the trauma area, for example. They see some very sick patients (like some with spleen, liver or kidney lacerations). They can initally evaluate these patients, order tests, read the xray/CT, and decide to admit if necessary as well as write admission orders. The RNs carry out the NP orders just like they do the MD orders. What the NP don't do is work in the shock trauma area (this is the full "trauma, life in the ER type area). They work in the same area with a 2nd year surgery resident, but, unlike the resident, they don't go over to the shock trauma area when those patients come in. The basic premise is that they stay in the trauma assessment area and help keep if from getting too backed up.
What made me go to med school after being a NP for several years is that I want to be the one that the buck stops at. I prefer dealing with the sicker, more complicated patients, which, generally NP's don't. I like doing procecures and NP gereally get a lot of flack for trying to do procedures. And NP is NEVER the person who the buck stops at. And now that I've been in medical school, I've decided to do general surgery. NP's can't do operations.
But, in general, yes, being a NP is very much like being a MD and patients really can't tell the difference.