Autonomic outflow from the medulla is divided principally into sympathetic and parasympathetic (vagal) branches. Efferent fibers of these autonomic nerves travel to the heart and blood vessels where they modulate the activity of these target organs. The heart is innervated by vagal and sympathetic fibers.
Best Answer: The cold war didn't have a specific start or ending time but if i had to give one I'd say that it started right after WWII (1945) and ended in the early 90's, probably 1991, the fall of the Soviet Union. Source(s): xzorion54 Â· 9 years ago.
The Cold War lasted about 45 years. There were no direct military campaigns between the two main antagonists, the United States and the Soviet Union.Yet billions of dollars and millions of lives were lost in the fight.or most of the second half of the 20th century, the USSR and the United States were engaged in a Cold War of economic and diplomatic struggles. The communist bloc, as it appeared in 1950, included countries to the west and southeast of the Soviet Union.