What is the main effect of excessive inhibition of cholinesterase?

• A. Increased heart rate
• B. Nervous system malfunction
• C. Respiratory failure
• D. Allergic reactions

Answer: (B)

The main effect of excessive inhibition of cholinesterase is indeed nervous system malfunction. Cholinesterase is an enzyme that breaks down acetylcholine, a neurotransmitter that plays a crucial role in transmitting signals within the nervous system. When cholinesterase is excessively inhibited, acetylcholine accumulates at synaptic junctions, leading to continuous stimulation of neurons.

This overstimulation can disrupt normal nerve function and result in a range of symptoms associated with nervous system malfunction. These symptoms may include muscle twitching, paralysis, confusion, seizures, and in severe cases, it can lead to a state of crisis known as cholinergic crisis. As acetylcholine remains active in the synapses longer than normal, the communication between nerves and muscles becomes impaired, severely affecting bodily functions.

While respiratory failure is a possible outcome of severe nervous system malfunction (which can occur if muscles involved in breathing are paralyzed), it is not the primary effect directly associated with excessive cholinesterase inhibition. Allergic reactions involve immune responses and do not relate to cholinesterase activity. Increased heart rate might occur due to a variety of factors but is not a direct consequence of cholinesterase inhibition. Therefore, the option that most accurately captures the main effect