Final answer:
A signal enters the nerve cell body through the dendrites and leaves the neuron through the axon. Dendrites are the structures that receive signals and axons are the structures that carry signals away from the neuron's body to other cells.
Step-by-step explanation:
A signal enters a nerve cell body through the dendrites and leaves the neuron through the axon.
Overview of Neuron Structure and Function
The cell body of a neuron, also called the soma, contains the nucleus and mitochondria. The dendrites are branch-like structures that receive signals from other neurons and transfer the nerve impulse to the soma. Once the dendrite receives a signal, it travels to the cell body, and then the integrated signal is sent through a structure known as the axon hillock. The axon is a long tube-like structure that carries the action potential, or nerve impulse, away from the neuron's cell body to another excitable cell, which could be another neuron, a muscle cell, or a gland. The axon may be covered with myelin, which acts as insulation to increase the speed of the nerve impulse. The terminals at the end of the axon, called axon terminals, release chemicals to communicate signals to other cells.