Most organs are innervated by neurons from both the sympathetic and parasympathetic nervous systems, a phenomenon referred to as . i. dual innervation
ii. antagonism
iii. sympathetic tone

Most organs are innervated by neurons from both the sympathetic and parasympathetic nervous systems, a phenomenon referred to as Dual innervation.

the principles and empirical processes of discovery and demonstration considered characteristic of or necessary for scientific investigation, generally involving the observation of phenomena, the formulation of a hypothesis concerning the phenomena, experimentation to test the hypothesis, and development of a conclusion that confirms, rejects, or modifies the hypothesis.