Final answer:
Neostigmine improves muscle tone and strength by inhibiting the breakdown of acetylcholine. It helps restore lost functions in disorders like myasthenia gravis and reverses the effects of muscle relaxants after surgery.
Step-by-step explanation:
Neostigmine improves muscle tone and strength by inhibiting the enzyme acetylcholinesterase, which breaks down the neurotransmitter acetylcholine. By blocking this enzyme, more acetylcholine is available in the synapse, enhancing communication between neurons. This increase in neuronal communication helps to restore lost functions in disorders like myasthenia gravis and can also reverse the effects of muscle relaxants after surgery.