Which of the following systems includes the brain, spinal cord, and nerves?

The system that includes the brain, spinal cord, and nerves is the nervous system. This system is primarily responsible for coordinating and controlling bodily functions by transmitting signals throughout the body. The brain acts as the central processing unit, where information is received, processed, and responses are initiated. The spinal cord serves as the main pathway for information traveling between the brain and the rest of the body, while the nerves carry signals to and from different parts of the body, facilitating communication between the central nervous system and peripheral organs.

By understanding the nervous system's components and their functions, it's clear how critical they are for processes such as movement, sensation, and reflexes. This system plays a vital role in maintaining homeostasis and responding to internal and external stimuli.