Final answer:
Dual innervation refers to an organ receiving both sympathetic and parasympathetic innervation, allowing for the control of opposing functions in organs.
Step-by-step explanation:
Dual innervation refers to an organ receiving both sympathetic and parasympathetic innervation. The autonomic nervous system is responsible for regulating internal organ functions, and it consists of two divisions: the sympathetic division and the parasympathetic division. The sympathetic division is associated with the fight-or-flight response, while the parasympathetic division is associated with rest and digest activities. Dual innervation allows for the balance and control of these opposing functions in organs.