Final answer:
During stressful periods, the body releases hormones such as adrenaline and cortisol to prepare for the fight-or-flight response. Adrenaline increases heart rate and awareness, while cortisol provides a boost of energy. Sustained elevated levels of cortisol can weaken the immune system.
Step-by-step explanation:
Rising and Falling Hormone Levels During Stressful Periods
During stressful periods, the body responds by releasing hormones that prepare it for the fight-or-flight response. The sympathetic nervous system triggers the release of adrenaline, which leads to increased heart rate, dry mouth, and heightened awareness. The hypothalamic-pituitary-adrenal (HPA) axis also becomes active, releasing cortisol, a stress hormone that provides a boost of energy. However, sustained elevated levels of cortisol weaken the immune system and can have negative health effects.