What causes the immediate stress response?

What causes the immediate stress response?

• A. Changes to the sympathetic nervous system
• B. Cortisol secretion by adrenal glands
• C. Perception of threat
• D. Increased immune activity

Answer: (A)

The immediate stress response is produced by the sympathetic branch of the autonomic nervous system. When a threat is recognized, brain areas like the amygdala rapidly signal the hypothalamus, which activates the sympathetic system to prepare the body for action. This leads to quick changes such as faster heart rate and quicker breathing, driven by adrenaline from the adrenal medulla. Cortisol release from the adrenal glands is part of a slower, longer-lasting response (the HPA axis) and takes longer to kick in, so it isn’t the immediate trigger. Immune activity isn’t the initiating cause of the rapid stress response. The perception of threat is what starts the cascade, but the immediate, driving factor is the sympathetic nervous system’s activation.

The immediate stress response is produced by the sympathetic branch of the autonomic nervous system. When a threat is recognized, brain areas like the amygdala rapidly signal the hypothalamus, which activates the sympathetic system to prepare the body for action. This leads to quick changes such as faster heart rate and quicker breathing, driven by adrenaline from the adrenal medulla. Cortisol release from the adrenal glands is part of a slower, longer-lasting response (the HPA axis) and takes longer to kick in, so it isn’t the immediate trigger. Immune activity isn’t the initiating cause of the rapid stress response. The perception of threat is what starts the cascade, but the immediate, driving factor is the sympathetic nervous system’s activation.