GSU BIOL 2240 - Cardiovascular-4 (37 pages)

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Cardiovascular-4



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Cardiovascular-4

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Pages:
37
School:
Georgia State University
Course:
Biol 2240 - Intro to Human Physiology
Intro to Human Physiology Documents

Unformatted text preview:

Cardiovascular system consists of Muscular pump the heart Series of conduits blood vessels Fluid blood Heart Function Generates blood pressure to move blood through vessels Regulates blood supply changes in rates and force to meet demands Routes blood through systemic or pulmonary circulation pulmonary vein Pulmonary circuit The human heart has four chambers two atria and two ventricles The atria receive blood from the body and deliver it to the ventricles The ventricles then pump the blood out to the body The right ventricle pumps blood through the pulmonary circuit The left ventricle pumps blood through the systemic circuit Rt atrium Rt ventricle Systemic circuit Valves prevent backflow of blood Atrioventricular AV valves lie between the atria and ventricles and prevent backflow when ventricles contract The pulmonary valve and aortic valve SL valves lie between the ventricles and the major arteries and prevent backflow when ventricles relax Tricuspid valve Bicuspid valve The right atrium receives deoxygenated blood from the body through large veins pulmonary vein Pulmonary circuit Rt atrium Rt ventricle Superior vena cava blood from upper body Inferior vena cava blood from lower body Systemic circuit Blood passes from the right atrium through Rt AV tricuspid valve into the right ventricle The atrium contracts then the ventricle the AV valve closes and blood is pumped through the pulmonary artery to the lungs where it is oxygenated pulmonary vein Pulmonary circuit Rt atrium Rt ventricle Systemic circuit Oxygenated blood returns to the left atrium of the heart through the pulmonary veins The ventricle fills as blood enters through Left AV bicuspid valve The left atrium contracts then the ventricle the aortic valve opens and blood circulates through the aorta pulmonary vein Pulmonary circuit Rt atrium Rt ventricle Systemic circuit 1 Direction of blood flow Blood returning to heart fills atria putting pressure against AV valves AV valves are forced open Atrium Cusp of



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