# Components

## Components

CellML divides the mathematical model into distinct components, which are able to be re-used. The main CellML components are:

Clamped current component (the ionic current during a voltage clamp)

Ionic concentrations component for

*Ca*^{2 + }_{i},*Na*^{ + }_{i}and*K*^{ + }_{i}Gating kinetics component – a single definition instantiated for the d, f, x, and y gates

Channel states for the MM formalism of IBK, INa and ICaL

Nernst potential component, a single definition instantiated for Na, Ca2+ and K

Each of these blocks is itself a CellML model, which enables us to reuse the various components in future studies and models.