Since the brain is not a muscle why it work effortlessly that without conscious effort?

The brain is not a muscle, but it is a complex organ composed of billions of neurons that communicate with each other through electrical and chemical signals. These signals are processed in different parts of the brain, which work together to control various bodily functions, including movement, thinking, and emotion. Although the brain does not require conscious effort to function, it does require energy in the form of glucose, oxygen, and other nutrients to operate. Additionally, many of the brain's functions are subconscious, meaning they occur without our awareness or control, while others, such as voluntary movement and thought, require conscious effort. The perception that the brain works effortlessly may be due to the fact that many of its processes occur automatically and without our awareness.