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URL:https://www.learndesk.us/class/5691831830446080/lesson/c92235008de99cc98dd384fec2fbce0b?ref=outlook-calendar
SUMMARY:10.3 Origin and Conduction of the Heart Beat
DTSTART;TZID=America/Los_Angeles:20260407T190000
DTEND;TZID=America/Los_Angeles:20260407T200000
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DESCRIPTION: The rhythmic contraction of the heart is called the heartbeat. The impulse to contract is generated rhythmically in specialized NODAL TISSUE in the wall of the right atrium, the SINO-AURICULAR NODE (the pacemaker). The wave of excitation spreads throughout the muscles of both atria which then contract. The heartbeat is not transmitted from the auricles to the ventricles directly. The impulse from the auricular muscles is picked up by another mass of nodal tissue, the atrioventricular node, and relayed by Purkinje tissue, in the Bundle of His and its branches lying beneath the endocardium on the interventricular septum to the muscles of both ventricles which then contract together, while the atria are relaxing. An electrocardiograph records the electrical changes in heart muscle caused by contraction and relaxation. Although the heart initiates its own impulse to contract, the body's changing needs are controlled by nervous impulses discharged from control centers in the brain and...

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