What effect is likely observed in clients exposed to sarin?

Clients exposed to sarin, which is a highly toxic nerve agent, typically exhibit a range of symptoms that affect the nervous system and respiratory functions. The correct choice highlights paralysis of respiratory muscles as a significant effect of sarin exposure. This occurs due to the way sarin interferes with the normal functioning of the nervous system. Sarin inhibits the enzyme acetylcholinesterase, leading to an accumulation of acetylcholine in the synapses. This excess acetylcholine overstimulates the muscles and can result in paralysis, particularly in critical muscle groups like those required for respiration.

The paralysis of respiratory muscles is particularly concerning because it can lead to respiratory failure, which is a life-threatening condition that requires immediate medical intervention. While other symptoms caused by sarin exposure may include severe headaches and a change in heart rate, the paralysis of respiratory muscles is a direct result of the neurotoxic effects of the agent, making it a defining characteristic of severe sarin poisoning. Additionally, uncontrolled bleeding is not commonly associated with sarin exposure and is more related to trauma or other types of toxins.