What does the nervous system primarily transmit?

The nervous system primarily transmits nerve impulses, which are electrical signals that carry information throughout the body. These nerve impulses are generated by neurons, the specialized cells of the nervous system, and they allow for rapid communication between different parts of the body. This communication enables the body to react to stimuli, coordinate movements, and perform a wide range of functions necessary for survival and interaction with the environment.

Nerve impulses are integral to processes such as sensation, motor control, and reflex responses. For instance, when you touch a hot surface, sensory neurons transmit nerve impulses to the brain, signaling danger and prompting an immediate motor response to withdraw your hand.

The other options, while they relate to bodily functions, are not the primary focus of the nervous system. Nutrients are transported by the circulatory system, blood carries oxygen and nutrients as well, and air is involved in respiration, which is also separate from the direct functions of the nervous system in transmitting signals.