Cardiac cycle

 The impulse for heart beat originates in the SA node and causes the atria to contract first, atrial systole followed by the ventricles, ventricular systole. After contraction the chambers go into diastole, which is the period of relaxation and blood fills the chambers during this period.

Courtsey: Mariana Ruiz Villarreal


Creative Commons license icon
This work is licensed under a Public Domain Creative Commons license

about                    contact us              disclaimer             faqs                    privacy           LifeHugger © 2008-2017