Though I am unsure of the answer myself, I've recently studied cells in school. I believe that the series of sacs and tubes are collectively called the endoplasmic reticulum, located mostly near the nucleus in the center of the plant or animal cell.
The answer would be c. I think it's right. Hope it helps!!
Answer:
An impulse travels from one nerve to another by release & subsequent diffusion of chemicals called neurotransmitters across a very small gap between neurons, called a synapse.
Explanation:
So in this case it would be transmitted via the cell membrane (Synapse)