Which statement best describes the nervous system?

Which statement best describes the nervous system?

• A. The signal is transmitted by the bloodstream
• B. The signal is an action potential
• C. The speed of the signal is slow
• D. The effect is long lasting

Answer: (B)

The nervous system communicates through electrical impulses called action potentials that travel along neurons and across synapses to produce rapid, targeted responses. This fundamental signal is an all-or-nothing electrical event that propagates quickly along axons, especially when fibers are myelinated, allowing fast communication throughout the body. That’s why the statement describing the signal as an action potential is the best choice. The bloodstream carries hormones in the endocrine system, not the primary signal for neural communication. Nerve signals are typically fast rather than slow, with myelination and fiber diameter influencing speed. And the effects of neural signaling are usually brief and quickly terminated, whereas long-lasting effects are more characteristic of hormonal (endocrine) signaling.

The nervous system communicates through electrical impulses called action potentials that travel along neurons and across synapses to produce rapid, targeted responses. This fundamental signal is an all-or-nothing electrical event that propagates quickly along axons, especially when fibers are myelinated, allowing fast communication throughout the body.

That’s why the statement describing the signal as an action potential is the best choice. The bloodstream carries hormones in the endocrine system, not the primary signal for neural communication. Nerve signals are typically fast rather than slow, with myelination and fiber diameter influencing speed. And the effects of neural signaling are usually brief and quickly terminated, whereas long-lasting effects are more characteristic of hormonal (endocrine) signaling.