Fig. 4.4  (a) Cardiac cycle and (b) blood pressure (Source of videos and images below. Used with permission)


                                                                                        (a) Cardiac cycle

                                                                                        (b) Blood Pressure

See the image below and the video of the heart beating at It shows an animation of an opened human heart performing cardiac cycles. The red line in the graph below the animation shows the rising and falling blood pressure of the "Aortic pressure" in a main artery, the aorta. Notice that the blood pressure rises as the ventricles contract during systole and falls as the ventricles relax during diastole. In this example, the systolic pressure rises to 120mmHG, and the the diastolic pressure falls to 80mmHG, hence the blood pressure is “120/80”. The small pressure bump at the beginning of diastole is from the pulse wave bouncing back from lower arteries.



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Source of videos and images. Used with permission.

Description       English: CG Animated Human Heart cut section showing the atria, ventricles and valves, synced with wiggers diagram.

Date             23 December 2016

Source         Own work: Cardiac Cycle, Wiggers diagram derived from User:Xavax

Author        DrJanaOfficial

(Reusing this file)                 This work is free and may be used by anyone for any purpose. If you wish to use this content, you do not need to request permission as long as you follow any licensing requirements mentioned on this page.

Modified by: A.G. DiGiovanna

Covered part of Wiggers diagram and added explanations.


Description         English: Human heart shown during sistole and diastole

Français : Le cœur humain, au cours de la diastole et de la systole. Légende en anglais

Date                     the original image i did arround 2006. this correction i am uploading it at oct 2008

Source                Own work

Author                Mariana Ruiz Villarreal (LadyofHats)

(Reusing this file)                 This work has been released into the public domain by its author, LadyofHats. This applies worldwide.

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