<prompt> True regarding autonomic system isHigh centre of integration is medulla oblongataConduction autonomic fibres is same as in somatic motor fibresPreganglionic parasympathetic fibres are more lengthyRatio of preganglionic and post ganglionic fibres is 20:1  <response>: Autonomic nervous system- The highest centre is the hypothalamus.- Conduction speed is slower in ANS compared to somatic nerves. ANS is non-myelinated. - Preganglionic parasympathetic fibers are lengthier because parasympathetic ganglia lie closer to the organs.- Ratios of preganglionic to post ganglionic fibers are 1:20 to 1:100 in sympathetic system. 