What hormone is released into the bloodstream during an alarm reaction?

• A. Adrenaline
• B. Dopamine
• C. Cortisol
• D. Endorphin

Answer: (A)

During an alarm reaction, the body kicks in the fight-or-flight system. The adrenal medulla releases adrenaline into the bloodstream, and this quick surge prepares you to act: heart rate and blood pressure rise, airways open, blood is routed to the muscles, and glucose is released for immediate energy. This response happens in seconds and is designed for rapid action.

Cortisol, released later, helps sustain energy during ongoing stress. Dopamine is a neurotransmitter tied to motivation and reward, not the immediate alarm response. Endorphins help modulate pain but aren’t the primary hormone of the alarm reaction. For a rapid, bloodstream-triggered change to ready the body for action, adrenaline is the correct hormone.