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Chapter

Circulatory System: The Heart Contents

15 Pages
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Department
Physiology
Course Code
Physiology 1021
Professor
John Ciriello

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Description
5th Week June0211 746 AM Module 8Circulatory System 1 The Heart Contents The HeartDuring the course of an average life the heart will beat roughly 25 billion timesyYou also have roughly 160000 km 100000 miles of blood vessels that transport blood directly to yalmost every cell in your body The Four Principal Functions of the cardiovascular system 1 It transports oxygen and nutrients to all cells of the body 2 Transports carbon dioxide and waste from the cells3 It helps regulate body temperature and pH4 It transports and distributes hormones and other substances within the body AnatomyThe HeartConsists of two sidebyside pumps y 1 the right atrium and ventriclewhich pumps blood TO LUNGS2 Theleft atrium and ventriclewhich pumps blood to the rest of the bodyThe wall of the left ventricle is MUCH THICKER than the wall of the right yThe left ventricle which delivers blood to the entire body must contract more forcefully to propel yblood through the entire systematic circulation The right ventricle only propels blood to nearby lungstherefore DOES NOT need to contract as yforcefully The vales in the heartwhich ensure the ONEWAY flow of blood through the heart may have yseveral different namesThe right atrioventricular valve AV also called the tricuspid valveyThe left atrioventricular valve AV also called the bicuspid valve y Superior Vena Cava delivers blood to the heart from the head and upper limbs Pulmonary Artery blood leaving the right ventricle travels to the lungs through this arteryAorta blood leaving the left ventricle travels through the aorta and is distributed to the entire bodyRight Atrium receives blood from the entire bodyThis blood is LOW in oxygen and HIGH in carbon dioxide yThe right atrium will then pump the blood into the right ventricle through the right atrialyventricular AV or tricuspid valve Left Atrium receives blood that has come from the lungs This blood is rich in oxygen and LOW in carbon dioxidey It will then pump the blood into the left ventricle through the left atrialventricular AV or ybicuspid valveRight Ventricle pumps blood into the pulmonary artery The pulmonary artery then delivers this blood to the lungs for gas exchangeyLeftVentricle pumps blood into the aorta which then distributes the blood to the entire body Circulation Through the HeartAfter flowing through the entire body the blood enters the heart at the right atrium yFrom the right atrium it passes through the right atrioventicular valve and into the right ventricleyWhen the right ventricle contracts it ejects blood out of the hear through the pulmonary valve yand into the pulmonary artery to the lungsAfter passing through the lungs removing CO2 and picking up oxygen the blood returns through ythe pulmonary vein to the left atrium From here the blood enters the left ventricle through the left atrioventricular valve yWhen the left ventricle contracts blood is ejected through the aortic valve into the aorta and out yof the body
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