Which system is responsible for controlling both voluntary and involuntary activities in the body?

The nervous system is fundamentally responsible for controlling both voluntary and involuntary activities in the body. It consists of the brain, spinal cord, and peripheral nerves, which facilitate communication between different parts of the body. Through this system, individuals can perform voluntary actions such as walking or talking, as well as involuntary actions such as breathing, heart rate regulation, and reflex responses to stimuli. The nervous system operates by sending electrical signals throughout the body, coordinating responses and maintaining homeostasis. This dual control mechanism is crucial for an organism's ability to interact with its environment and respond to internal and external changes effectively.

In contrast, the cardiovascular system primarily focuses on the circulation of blood, the skeletal system provides structural support and protection for the body, and the muscular system is responsible for movement. While these systems contribute to bodily functions, they do not encompass the comprehensive regulatory role that the nervous system plays.