What is the primary function of motor neurons (efferent)?

The primary function of motor neurons, also known as efferent neurons, is to carry outgoing information from the central nervous system to various effectors, such as muscles and glands. These neurons are integral to the process of initiating movement and controlling bodily functions. When a motor neuron sends a signal, it can lead to muscle contraction or stimulate gland activity, thereby facilitating actions that are essential for daily functioning and responding to the environment.

Motor neurons essentially function as the output pathway of the nervous system, bridging the gap between the brain or spinal cord and the peripheral systems that execute physical actions or hormonal responses. This is fundamental in enabling an organism to react to stimuli or perform voluntary and involuntary movements.

The other options presented relate to different functions and systems. For instance, transmitting sensory information pertains to sensory neurons, which bring information from sensory receptors to the brain, whereas regulating internal body temperature involves autonomic processes that are managed by a combination of different neural pathways, including involuntary reflex arcs but not limited to motor neurons. Supporting the immune response is primarily the function of the immune system and leukocytes, rather than the neural transmission roles of motor neurons. Hence, the correct answer accurately reflects the specialized role of efferent neurons within the nervous system.