Which of the 11 body systems is responsible for coordinating activities that are performed both inside and outside the body?

The nervous system is primarily responsible for coordinating activities within the body and responding to external stimuli. It achieves this through a complex network of neurons that transmit signals between different parts of the body, including the brain, spinal cord, and peripheral nerves.

In terms of internal coordination, the nervous system controls processes such as reflexes, muscle movements, and sensory perceptions, allowing for quick responses to changes in the environment. It also plays a crucial role in higher cognitive functions like thinking, memory, and decision-making. Externally, it enables the body to interact with the environment, ensuring that reactions are timely and appropriate, such as pulling your hand away from a hot surface.

Other body systems play vital roles in functions like digestion, hormone regulation, and movement, but they do not coordinate activities to the same extent as the nervous system. The endocrine system, for instance, regulates long-term processes through hormones, and the muscular system allows for movement but does not manage coordination among internal and external activities as effectively as the nervous system does.