Parasympathetic NS

Which part of the autonomic nervous system is most affected by medicines?

• Afferent arm

• Central nuclei in the hypothalamus

• Efferent arm

By what mechanism do indirect PSYmimetics act?

• Inhibit the enzyme that catalyses the breakdown of ACh

• Excite mACh receptors on effector cells

• Excite nACh receptors on effector cells

• Inhibit mACh receptors on the PSY terminals

Where do the parasympathetic (preganglionic) fibres derive from?

• From the craniosacral section

• From the thoraco-lumbal section

• From the Cortex

• From the myenteric and submucous plexus

What is the mechanism of action of direct PSYmimetics?

• Inhibit mACh receptors on the PSY terminals

• Excite nACh receptors on the PSY terminals

• Inhibit the enzyme that catalyses the breakdown of ACh

• Excite mACh receptors on the PSY terminals

Which is the PSYmimetics that possesses a significant effect on nicotinic ACh receptors?

• Pilocarpine

• Metacholine

• Betanechol

• Carbachol

What is the antidote for muscarinic poisoning?

• Pralidoxim

• Atropine

• Curare

• Physostigmine

Which is NOT a symptom of the poisoning with irreversible cholinesterase inhibitors?

• mydriasis

• bronchospasm

• sweating, hypersalivation

• muscle cramps

In which condition is the administration of PSYmimetics NOT contraindicated?

• mechanical obstruction of the urogenital tract

• bradycardia

• glaucoma

• asthma bronchiale