After someone faints, smelling salts of ammonia may be placed under the person's nose. The person breathes the ammonia vapors, which deliver a sharp jolt to the nasal membranes, and the person wakes up. This illustrates

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Smelling salts of ammonia stimulate the olfactory nerves and send signals to the reticular activating system, which plays a role in controlling wakefulness and consciousness. The sharp jolt from the ammonia vapors can help to activate the brain and bring a fainting person back to consciousness. This illustrates the function of sensory input to the reticular activating system.

After Someone Faints, Smelling Salts of Ammonia May Be Placed