Final answer:
Epinephrine is the primary hormone responsible for stimulating fatty acid mobilization during the first minutes of exercise, as it triggers the fight-or-flight response that provides energy for the body.
Step-by-step explanation:
The primary hormone for stimulating fatty acid mobilization during the first minutes of exercise is epinephrine. This hormone mediates the fight-or-flight response, which increases the amount of glucose and fatty acids available to muscles. When the body is exposed to short-term stresses, such as the initiation of exercise, epinephrine is released from the adrenal medulla and triggers the breakdown of glycogen in the muscle and liver, as well as the mobilization of fatty acids from adipose tissue.
This acute stress response provides immediate energy sources for the body to cope with the demands of exercise.