do sympathetic nerve fibres secrete noradrenaline hormone into them for their activation?

Dear Soumya,

Sympathetic nerve fibres do secrete nonadrenaline (=nonepinephrine) hormones in some animals at the time of “Fight or Flight” response.

Fight or flight response is a physiological reaction that occurs in response to percieved harmful event or attack.

In the image attached, you will see that a cat is trying to threat (Fight) the dog. As the cat is percieving a harmful attack. Next, the event will be like the cat will run away (Flight).

Hope the answer of the question.