The primary component of the human brain is neural tissue, specifically neurons and glial cells. Neurons are the fundamental units responsible for transmitting signals throughout the brain and nervous system, allowing for communication between different brain regions and the body. Glial cells, meanwhile, provide support, nourishment, and protection to neurons. The brain's intricate structure and connections enable complex functions such as thought, memory, emotion, and coordination. Compositionally, the brain is made up of approximately 75% water, with the remaining components consisting of fats, proteins, and various organic molecules essential for neural activity.