Final answer:
The adrenal gland releases hormones such as epinephrine and norepinephrine during emergencies to trigger the fight-or-flight response. (option A is the correct answer).
Step-by-step explanation:
The endocrine gland that releases a hormone during emergencies is the adrenal gland. Specifically, it secretes epinephrine (adrenaline) and norepinephrine (noradrenaline), which are responsible for the fight-or-flight response. This response prepares the body for rapid action in stressful situations by increasing heart rate, blood pressure, and energy supplies.
This hormone prepares the body for rapid, intense physical activity by increasing heart rate, dilating airways, and redirecting blood flow to critical organs and muscles. Adrenaline, along with other hormones like cortisol, collectively helps the body cope with acute stressors and navigate emergencies.
The adrenal glands play a pivotal role in the body's response to emergencies by releasing adrenaline, which initiates physiological changes to prepare the individual for swift and decisive action. This adaptive mechanism is crucial for survival in challenging situations.