Final answer:
The cordlike structures that carry impulses between different parts of the body are neurons, with axons that transmit nerve impulses. The spinal cord plays a key role in transmitting these impulses between the brain and the body.
Step-by-step explanation:
The cordlike structures that carry impulses from one part of the body to another are called neurons, or nerve cells. These neurons have long projections called axons that are responsible for transmitting nerve impulses. The nerve impulse is a bioelectric signal that travels along the axon to communicate with other neurons, muscle cells, and glands at junctions known as synapses or neuromuscular junctions. The spinal cord is a long, tube-shaped bundle of neurons that serves as an information superhighway, connecting the brain to the rest of the body. Within the spinal cord, there are sensory (afferent) nerves that carry nerve impulses to the brain from all over the body and motor (efferent) nerves that carry nerve impulses from the brain to muscles and glands.