The Human Brain

The human brain is an incredibly complex organ, serving as the control center of the nervous system. Weighing about 1.4 kilograms (3 pounds), it is responsible for thought, memory, emotion, movement, and processing sensory information. Despite making up only about 2% of the body's weight, it consumes approximately 20% of the body's oxygen and calories, highlighting its high metabolic demand. The intricate network of 86 billion neurons and trillions of connections (synapses) allows for sophisticated cognitive functions and adaptability.