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Neurons

Neurons. A. Axon B. Dendrites C. Neurotransmitters D. Sodium ions E. Terminal branches.

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Neurons

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  1. Neurons

  2. A. Axon B. Dendrites C. Neurotransmitters D. Sodium ions E. Terminal branches Chemical messengers called neurotransmitters enter receptor sites on the dendrites and cell body. This causes the cell membrane to open up and sodium ions to flow in. When there is enough of a positive charge, the neuron reaches threshold, and the first section of the axon opens up and sodium ions flow in. This exchange of sodium ions happens down the length of the axon. When the signal reaches the terminal branches at the end of the axon, neurotransmitters flow out into the empty space called the synapse.

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