hjärna

Hjärna is the Swedish word for brain. The brain is a complex organ that is the control center of the nervous system. It is responsible for thoughts, emotions, memory, and movement. In humans, the brain is located in the skull and is protected by the bones of the cranium. It is composed of billions of nerve cells, called neurons, and other specialized cells. The brain is divided into several main parts, each with distinct functions. The cerebrum, the largest part, is responsible for higher-level functions like thinking, language, and voluntary movement. The cerebellum plays a key role in coordinating movement, balance, and posture. The brainstem connects the cerebrum and cerebellum to the spinal cord and controls essential life functions such as breathing, heart rate, and sleep. The brain receives information from the body's sensory organs and sends signals back to the muscles to produce actions. Its intricate network of neurons allows for complex processing of information and the ability to learn and adapt. Research into the brain continues to expand our understanding of its remarkable capabilities and the mechanisms underlying consciousness and behavior.