Physiology Autonomic nervous system the cholinergic nerve fibres A All preganglionic fibres, releases acetycholine B Post ganglionic cholinergic fibres secretes acetyl choline C The post ganglionic sympathetic cholinergic nerve fibres supplies sweat glands and blood vessels inheart and skeletal muscles D All of the above 💡 Explanation Autonomic nervous system the cholinergic nerve fibres ✓ Correct Answer: D. All of the above