Sympathetic innervation refers to the nervous system's ability to send signals to various parts of the body, helping control certain functions. It's the process of sympathetic nerves providing support to organs, muscles, and blood vessels, assisting with things like regulating heart rate, dilating pupils, or increasing blood pressure during times of stress or danger.
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Practice of the Wim Hof Method made Hof's skin temperature relatively invariant to cold exposure, a finding the researchers attributed to his
increased sympathetic innervation and glucose consumption in intercostal muscle revealed by PET imaging.
Sympathetic innervation of pancreas: norepinephrine — > adrenergic receptor activation = decreased insulin secretion & increased lipolysis (Stich et al., 1999):
This fact indicates that in the bird, in contrast to mammals, neither the retinas nor
sympathetic innervation of the pineal body are essential for environmental control of melatonin formation.