Which tissue type is primarily involved in signaling throughout the body by electrical impulses?

• A. Epithelial
• B. Muscle
• C. Connective
• D. Nervous

Answer: (D)

The main idea here is that rapid, body-wide communication relies on a tissue specialized for electrical signaling. Nervous tissue, made up of neurons and supporting glial cells, is designed to generate and propagate electrical impulses along neurons and to transmit signals across synapses. This enables fast, long-distance communication that coordinates sensation, movement, and autonomic functions. In contrast, epithelial tissue forms barriers and glands, connective tissue provides support and transport, and muscle tissue primarily carries out contraction. None of those are structured to signal throughout the body using electrical impulses like nervous tissue.