More early signs of pregnancy include an aching head, a result of changes in hormones. Just in case you are indeed pregnant, take pg-safe acetaminophen instead of ibuprofen to deal with the pain.
Organs Without Dual Innervation. Although most organs are innervated by both sympathetic and parasympathetic nerves, some-including the adrenal medulla, arrector pili muscles, sweat glands, and most blood vessels-receive only sympathetic innervation.
The sympathetic nervous system stimulates the adrenal medulla to secrete its hormones. One of the glands that the sympathetic nervous system stimulates is the adrenal medulla. Upon stimulation, the gland secretes its hormones into your bloodstream.