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| the first menstrual period; the establishment of menstruation |
| a contracting muscle whose action is opposed by another muscle |
| reflex arc | |
| —n | |
| physiol the neural pathway over which impulses travel to produce a reflex action, consisting of at least one afferent (receptor) and one efferent (effector) neuron | |
reflex arc n.
The route followed by nerve impulses to produce a reflex act, from the periphery through the afferent nerve to the nervous system, and thence through the efferent nerve to the effector organ.