GCSE Science Revision Biology ＂The Brain＂ (Triple)

The brain is the control centre of the nervous system. It is made up of billions of nerve cells and trillions of connections, which enable us to think, feel, move and react to our environment. The brain is divided into different regions, each with its own special function. These include the cerebrum, cerebellum, brain stem and thalamus. The cerebrum is the largest and outermost layer of the brain. It's responsible for conscious thought, movement, sensation and memory. The cerebellum is located at the base of the brain and is responsible for balance and coordination. The brain stem connects the brain to the spinal cord and controls vital functions such as breathing and heart rate. The thalamus is located in the centre of the brain and acts as a relay station for sensory information. The brain uses electrical and chemical signals to communicate information between nerve cells. These signals are created by the movement of ions across the cell membranes. The balance of chemicals in the brain can affect our mood and behaviour. Imbalances in neurotransmitters such as dopamine, serotonin and noradrenaline have been linked to mental health problems such as depression, anxiety and schizophrenia. The brain is protected by the skull and a layer of cerebrospinal fluid, which cushions it from mechanical damage. Head injuries can cause damage to the brain, with symptoms ranging from mild concussion to severe brain trauma. Protecting the brain through good nutrition, exercise, and avoiding harmful behaviours such as drug and alcohol abuse is important for maintaining good mental and physical health.