Final answer:
Epinephrine, involved in the fight-or-flight response, causes widened pupils, tense muscles, and stopped digestion. However, it does not cause breathing to slow; breathing actually becomes faster.
Step-by-step explanation:
Epinephrine, also known as adrenaline, is a hormone that triggers the fight-or-flight response in the body. This response involves several physiological changes, including widening of the pupils (mydriasis), tensing of muscles as they prepare for action, and the suspension of non-essential functions like digestion. However, epinephrine does not cause the slowing of breathing; on the contrary, it typically causes breathing to become faster and deeper to increase oxygen supply to the muscles. Therefore, the body change not triggered by epinephrine is the slowing of breathing.