Overview The nervous system is the collection of specialized cells responsible for maintaining an organism’s internal environment and coordinating ...

Overview The parasympathetic nervous system is one of the two major divisions of the autonomic nervous system. This parasympathetic system is responsible ...

Overview The sympathetic nervous system—one of the two major divisions of the autonomic nervous system—is activated in times of stress. It ...

Overview The blood-brain barrier (BBB) refers to the specialized vasculature that provides the brain with nutrients in the blood while strictly ...

Overview Neurons are the main type of cell in the nervous system that generate and transmit electrochemical signals. They primarily communicate with each ...

Overview Glial cells are one of the two main types of cells in the nervous system. Glia cells comprise astrocytes, oligodendrocytes, microglia, and ...

Overview Neurons communicate by firing action potentials—the electrochemical signal that is propagated along the axon. The signal results in the ...

Overview The relative difference in electrical charge, or voltage, between the inside and the outside of a cell membrane, is called the membrane ...

Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the ...

Long-term depression, or LTD, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the ...

Neurons communicate with one another by passing on their electrical signals to other neurons. A synapse is the location where two neurons meet to exchange ...