Final answer:
Motor neurons transmit nerve impulses from the central nervous system to muscles and glands, and are activated when an action is performed, contrary to statement C which claims they do not respond to sensory information.
Step-by-step explanation:
Motor Neurons and Their Functions
One true statement about motor neurons is that they carry nerve impulses from the central nervous system to muscles and glands, converting nerve signals into activation of these structures. This means that when a human performs an action, motor neurons are indeed activated as they transmit impulses to muscles, causing them to contract. For example, if a motor neuron in the spinal cord receives touch information, it may transmit that information to another neuron that controls the movement of an arm muscle. Additionally, motor neurons have cell bodies in the ventral gray matter of the spinal cord and may project to muscles through the ventral root.
Glia, or glial cells, provide vital support and protection for neurons in the nervous system, including motor neurons. They do not produce action potentials like neurons; instead, they have several other important functions such as insulating axons with the myelin sheath and modulating communication between nerve cells.
Therefore, the statement C, which posits that motor neurons do not respond to sensory information, is false. Motor neurons can be directly or indirectly stimulated by sensory neurons, and they definitely respond when a person performs an action.