The cardiac cycle. Describing the sequence of events in one heart beat. Learning Intentions. Describe the cardiac cycle with reference to the action of the valves in the heart. Introduction.
Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.
Describing the sequence of events in one heart beat
= 0.8 sec
= 72 bpm
A Atrioventricular (bicuspid / mitral) valve(s) closes (“snaps shut”– makes 1st louder heart sound “LUB”
B Semilunar valve(s) (aortic valve) opens
C Semilunar valve(s) closes – makes second softer heart sound “DUB”- shut due to blood accumulating in their pockets
D Atriioventricular (bicuspid) valve(s) opens
Match the letter on the graph to the following events
No of beats per minute = 1 x 60/0.8 sec = 75 beats/min