A. Reflex
B. Neuron
C. Dendrite
D. Nerve
🧠 Explanation:
A nerve cell is called a neuron, responsible for transmitting electrical signals. “Neuron” is a noun; “responsible” is an adjective. Alternatives like “nerve fiber” exist, but neuron is precise terminology in biology and neuroscience. Understanding cell structure and function is essential in medical and life sciences.