Thus, higher hormone concentration alone cannot trigger the negative feedback mechanism. To help prevent an attack one can avoid the trigger. Stress is a factor that can trigger anxiety. An automatic firearm is capable of firing multiple rounds with one pull of the trigger. Some indirect agonists trigger neurotransmitter release and prevent neurotransmitter reuptake. Stress can trigger symptoms in susceptible animals. The pain can trigger cardiac issues as well. A bullpup is a firearm with its action behind the trigger. One of the proteins that trigger allergic reactions is tropomyosin. Like sunlight, emotional stress can also trigger rosacea. Auto loaders fire one round with each pull of the trigger. Virtually all microbes can trigger an antibody response. Democrats counterargued that allowing the weapons could trigger an arms race. That filtered output passes to the input of a Schmitt trigger. This loss may trigger cell death.