Fight or Flight Hormone in Stress Response

The endocrine system plays a crucial role in regulating numerous physiological processes through hormones. These hormones are secreted by various glands throughout the body, affecting diverse functions such as growth, metabolism, and mood. Understanding the key hormones and their respective glands is vital for grasping the overall function of the endocrine system.

Considering the hormones secreted during times of stress, which of the following hormones is primarily responsible for initiating the body’s 'fight or flight' response?