What are neural pathways primarily composed of?

Neural pathways are primarily composed of networks of neurons that communicate and transmit signals. These pathways consist of interconnected neurons that form complex networks throughout the nervous system, allowing for the processing and transmission of information. Neurons are specialized cells that transmit electrical impulses and communicate with each other through synapses, where neurotransmitters are released to facilitate communication. This intricate network is essential for various functions, including sensory perception, motor control, and cognitive processes. The strength and efficiency of these connections can be influenced by learning and experience, impacting behavior and neurological function.

Other options, while related to biological functions, do not accurately describe the structure of neural pathways. Hormones and enzymes play various roles in the body's physiological processes but do not form the pathways responsible for transmitting nerve signals. Muscle fibers are involved in movement but are not part of the neural architecture. Circadian rhythms are regulated by neural pathways but do not themselves constitute the neural pathways. Therefore, networks of neurons are the defining feature of neural pathways.