Physiology True regarding autonomic system is : A High center of integration is medulla oblongata. B Conduction autonomic fibers are same as in somatic motor fibers. C Preganglionic parasympathetic fibers are lengthier. D Ratio of pregnanglionic and post ganglionic fibers is 20:1. 💡 Explanation True regarding autonomic system is : ✓ Correct Answer: C. Preganglionic parasympathetic fibers are lengthier.