![]() Nervous system chemical and electrical signaling allow for quick responses to internal and external changes. After crossing the gap, neurotransmitters bind to receptor sites on the receiving neuron and stimulate an action potential in the neuron. This process is accomplished by exocytosis of the neurotransmitters. At chemical synapses, chemical signals called neurotransmitters are released which cross the gap junction to stimulate the next neuron. ![]() At electrical synapses, ions and other molecules pass through gap junctions allowing for the passive transmission of electrical signals from one cell to the other. It is at the synapse where chemical or electrical impulses must cross a gap and be carried to the dendrites of adjacent cells. These branches end at junctions called synapses. Since axons can have numerous branches, nerve impulses can be transmitted to numerous cells. Nerve impulses are received at neuronal dendrites, passed through the cell body, and are carried along the axon to the terminal branches. Nerve impulses, or action potentials, are electrochemical impulses that cause neurons to release electrical or chemical signals that initiate an action potential in another neuron. These nerves send signals between the brain, spinal cord, and other body organs via nerve impulses. Information is communicated among nervous system structures through nerve signals. Axons and dendrites are bundled together into what are called nerves. They have many synapses in order to receive signal messages from nearby neurons. Dendrites are usually more numerous, shorter, and more branched than axons.
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