The voltage-gated 'fast' sodium channel, that allows sodium ions to enter the cell via the apical membrane. The channel is gated by the m, h, and j gates.

This model was derived from the model by `Luo and Rudy (1991) <https://models.physiomeproject.org/exposure/2d2ce7737b42a4f72d6bf8b67f6eb5a2>`_ and made in the bond graph formalism by `Pan et al <https://doi.org/10.1098/rspa.2018.0106>`_.

`Corresponding bond graph model. <https://models.physiomeproject.org/workspace/826>`_

`Corresponding protein knowledge page. <https://models.physiomeproject.org/e/ba7>`_

Bond graph diagram
===================
.. figure:: exposure/BG_Na.png
   :width: 75%
   :align: center
   :alt: BG_Na