Brain

The brain is a complex organ that serves as the center of the nervous system in humans and other animals. Composed of billions of neurons, it controls thoughts, memory, emotion, touch, motor skills, vision, breathing, and every process regulating the body. In vertebrates, the brain is protected by the skull and connected to the spinal cord. Major regions include the cerebrum, cerebellum, and brainstem, each responsible for different functions. The brain communicates through electrical and chemical signals, enabling advanced cognitive abilities, sensory perception, and coordination of voluntary and involuntary actions vital for survival.