Your brain is not one big electrical signal. It’s actually hundreds of chemical conversations happening at once. These chemicals are neurotransmitters, and they control everything from motivation to movement. You’ve probably heard of dopamine and serotonin. Dopamine gets called the “pleasure” molecule and serotonin the “happiness” molecule. While those labels have tiny grains of truth, they’re mostly oversimplified marketing slogans. The real science is far more interesting,

Nervous Tissue: Spinal Cord Motor Neuron Every time you remember a name, learn something new, or drift off to sleep, two types of brain cells are working together: neurons and glia. Neurons: The Signal Carriers Neurons are the cells responsible for communication. You’ve probably heard the phrase, “Neurons that fire together, wire together.” A typical neuron has three main parts: the soma (cell body with the nucleus and organelles), dendrites (branches that receive signals fr