NREMT Paramedic Practice

Which of the following describes the action of parasympathomimetics?

1. Stimulating the sympathetic nervous system

2. Blocking adrenaline receptors

3. Mimicking effects of the parasympathetic nervous system

4. Reducing digestive tract activity

The correct answer is: Mimicking effects of the parasympathetic nervous system

The action of parasympathomimetics is to mimic the effects of the parasympathetic nervous system. This system is responsible for the "rest and digest" functions in the body, promoting relaxation, decreasing heart rate, and increasing digestive activity. Parasympathomimetics can stimulate bodily functions such as salivation, lacrimation (tear production), urination, digestion, and defecation, which are all associated with a state of calm and restoration. In contrast, stimulating the sympathetic nervous system would lead to a "fight or flight" response, which is not the function of parasympathomimetics. Blocking adrenaline receptors relates more to antagonists affecting the sympathetic system than to the mimicking action of the parasympathetic. Additionally, reducing digestive tract activity is contrary to the effects of parasympathomimetics, as these agents typically enhance digestion rather than inhibit it.