What is the main role of the dorsal hollow nerve cord in chordates?

The dorsal hollow nerve cord is a defining characteristic of chordates and serves a crucial role in the nervous system of these animals. Its primary function is to transmit signals between the brain and the rest of the body, facilitating communication and coordination of bodily functions. This nerve cord is situated dorsally to the notochord and develops into the central nervous system, particularly the brain and spinal cord, in vertebrates.

This structure enables the processing of sensory information, motor control, and other critical functions that are essential for the survival and interaction of the organism with its environment. The other options, while they may describe features in different biological systems, do not accurately depict the specific role performed by the dorsal hollow nerve cord in chordates. The structural support role is more accurately associated with the notochord, while respiration and digestion involve different organ systems.