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URL:https://www.learndesk.us/class/5691831830446080/lesson/d15112072b73945ee1fe28d6852297a2?ref=outlook-calendar
SUMMARY:10.2 The Heart
DTSTART;TZID=America/Los_Angeles:20260407T190000
DTEND;TZID=America/Los_Angeles:20260407T200000
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DESCRIPTION: The heart has four chambers which are lined with endothelium (endocardium). It has thick walls of muscle called the myocardium. Heart muscle is supplied with blood from the coronary arteries that branch off from the aorta. The heart is enclosed in a two-layered membrane, the pericardium. A thin film of fluid separates the layers of the pericardium. The cardiac muscles of the atria are completely separated from the cardiac muscle of the ventricle by a ring of fibrous tissue at the atrioventricular groove. (A-V groove). Extensions from this ring form the heart valves. Valves are attached by thin chordae tendinae to extensions of cardiac muscle called the papillary muscles.
The papillary muscles contract when the ventricles contract. They pull on the chordea so that the valve flaps cannot be everted, therefore in health, blood can flow in one direction only. The human heart is really a double pump. The right atrium receives blood from the body tissues with its oxygen supply diminished...

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