What effect can cholinergic agents have on sweating?

Cholinergic agents can increase sweating due to their action on muscarinic receptors, particularly those located in the sweat glands. These agents enhance the stimulation of the parasympathetic nervous system, which in turn promotes the secretion of sweat. When cholinergic agents are administered, they mimic the neurotransmitter acetylcholine, leading to increased glandular secretion, including that from sweat glands. This is especially true for agents that are direct agonists at the muscarinic receptors.

In contrast, the options suggesting inhibition of sweat gland activity or no effect on sweating do not align with the mechanism of action of cholinergic agents. Cholinergic agents are known for their stimulating effects on secretory glands, including those responsible for sweating. Similarly, the notion that they can completely stop sweating contradicts their primary action, which involves increasing secretions rather than inhibiting them. Thus, the correct answer reflects the physiological effects that cholinergic agents have on the body's sweat response.