Astrocytes are star-shaped cells in the brain and spinal cord that play a crucial role in supporting neurons. They help maintain the blood-brain barrier, regulate blood flow, and provide nutrients to nerve cells. Astrocytes also assist in repairing brain tissue after injury and help maintain the overall environment for neuronal function. In addition to their supportive roles, astrocytes are involved in neurotransmitter regulation. They help clear excess neurotransmitters from synapses, which are the connections between neurons. This process is essential for proper communication between nerve cells and contributes to overall brain health and function.