Describe (HT only) adrenaline as a hormone secreted by the adrenal glands in fear or stress.

In the subtopic Feedback systems (HT only), this learning objective focuses on describe (HT only) adrenaline as a hormone secreted by the adrenal glands in fear or stress. Within Hormonal coordination in humans, students should explain this idea in the exact curriculum context rather than as an isolated fact. Approved keywords for this objective include adrenal glands, adrenaline, and HT only. adrenaline means a hormone secreted by the adrenal glands in response to fear or stress, which prepares the body for 'fight or flight' by increasing heart rate and oxygen delivery. Avoid students often confuse adrenaline's function with that of other hormones, thinking it regulates long-term processes instead of immediate responses; instead remember that adrenaline is involved in the 'fight or flight' response, acting quickly to prepare the body for immediate action, rather than regulating long-term bodily functions. For exam answers, memorize the function of adrenaline and its source; focus on its secretion by the adrenal glands during fear or stress.