This man's name is applied to the effect in which the differences in the sensitivity of the eye between day and night conditions can be attributed.  
This man's name is applied to the effect in which the differences in the sensitivity of the eye between day and night conditions can be attributed.  He is also known for having coined the term "protoplasm", though its meaning has since changed.  His name also graces a particular model of cell genesis.  For ten points, name this Czech physiologist whose eponymous fibers relay cardiac impulses to the ventricular cells, causing the ventricles to contract.
This man's name is applied to the effect in which the differences in the sensitivity of the eye between day and night conditions can be attributed.  
Johannes Purkinje