Which of the following is a characteristic of nerve agents?

Nerve agents are a class of chemical warfare agents that specifically target the nervous system. They function by interfering with the normal transmission of nerve impulses, which can lead to a range of severe physiological effects, including paralysis and respiratory failure. These agents inhibit the enzyme acetylcholinesterase, which is responsible for breaking down the neurotransmitter acetylcholine. As a result, there is an accumulation of acetylcholine at the nerve synapses, causing continuous stimulation of muscles and organs, ultimately affecting vital functions.

The other choices do not accurately describe the primary action of nerve agents. While some chemical agents may act as respiratory irritants or cause blistering, these characteristics are more associated with other types of chemical agents, such as choking agents or blister agents, respectively. Additionally, the disruption of blood coagulation is primarily related to different types of agents, such as anticoagulants or specific types of warfare agents that affect blood components. Therefore, the defining characteristic of nerve agents is their ability to interfere with nerve transmission, making it the correct choice.