- Isovolumetric Contraction.

Isovolumetric Contraction  

This video talks about the isovolumetric contraction of the ventricles.

Isovolumetric Contraction: it is the phase occurring in early systole, during which the ventricles contract with no corresponding volume change.
 
During the time period between the closure of the AV valves and the opening of the aortic and pulmonic valves, ventricular pressure rises rapidly without a change in ventricular volume (i.e., no ejection occurs). Ventricular volume does not change because all valves are closed during this phase. Contraction, therefore, is said to be "isovolumic" or "isovolumetric."