The sodium-potassium ATPase, which pumps in 3 sodium ions into the cell for 2 potassium ions extruded, using ATP. This model was made by Pan et al. in the bond graph formalism `here. <https://arxiv.org/abs/1806.04341>`_

`Corresponding bond graph model. <https://models.physiomeproject.org/workspace/827>`_

`Corresponding protein knowledge page. <https://models.physiomeproject.org/e/bf6>`_

Bond graph diagram
===================
.. figure:: exposure/BG_NaK_full.png
   :width: 75%
   :align: center
   :alt: BG_full
   
Full model

.. figure:: exposure/BG_NaK_reduced.png
   :width: 75%
   :align: center
   :alt: BG_reduced
   
Reduced (steady state) model