Which tissue type provides rapid internal communication by transmitting electrical impulses?

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

Answer: (D)

Rapid internal communication relies on electrical signaling. Nervous tissue is made up of neurons and supporting glial cells that are excitable and capable of generating and transmitting electrical impulses called action potentials. When a neuron is stimulated, ion channels cause a rapid change in membrane potential that propagates along the axon, often aided by myelin to speed the signal. At the synapse, neurotransmitters cross to influence the next cell—another neuron, a muscle, or a gland—allowing fast, precise communication throughout the body. Epithelium forms barriers and coverings, connective tissue provides support and transport, and muscle tissue conducts and responds to signals, but nervous tissue is the specialized system for rapid electrical communication.