ANP 1105 Lecture Notes - Lecture 1: Left Coronary Artery, Coronary Sinus, The Delay
8 Jun 2016
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The heart"s internal pacemaker regulates and times the beating of the. Cardiomyocytes, or cardiac cells, are striated and are responsible for the. Electrical signals start at the sa node, causing atria contraction, and then o move on to av node, delaying electrical impulses to allow blood from the atrium to fill the ventricles. o. Purkinje fibers, which then allows the ventricles to contract. Signals move from the av node to the bundle of his and then to the. The main purpose of the heart is to pump blood through the body; it does so in a repeating sequence called the cardiac cycle. The cardiac cycle is the coordination of the filling and emptying of blood by electrical signals that cause the heart muscles to contract and relax. In each cardiac cycle, the heart contracts (systole), pushing out the blood and pumping it through the body. This is followed by a relaxation phase (diastole), where the heart fills with blood.
