Day 1: Cardiovascular System

compartments of the thoracic cavity
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Terms in this set (21)
Left AV valveOne of the AV valves. has two cusps. Also called the Bicuspid valve.semilunar valvesregulate the flow of blood from the ventricles into the great arteriespulmonary valvesone of the semilunar valves. controls the opening from the right ventricle into the pulmonary trunkaortic valveone of the semilunar valves. controls the opening from the left ventricle into the aorta.right and left atriathin-walled receiving chambers for blood returning to the heart by way of the great veinsright and left ventriclesthe pumps that eject blood into the arteries and keep it flowing around the bodyfibrous skeleton of the heartframework of collagenous and elastic fibers of heart. tissue especially concentrated in the walls between the heart chambers, in fibrous around the valves, and in the sheets of tissue that interconnect these ringschordae tendineae's connection to the papillary musclesprevent the AV valves from flipping inside out or bulging into the atria when the ventricles contractfunctions of fibrous skeleton of heartprovides structural support, reinforces the myocardium internally, structure for muscle to pull against, elastic recoil may aid in ventricular filling. NON-CONDUCTIVE- INSULATES ATRIA FROM VENTRICLESatrioventricular valvesregulate the openings between the atria and ventricles. Valves do not open and close by any muscular effort of their own. the cusps are simply pushed open and closed by changes in blood pressure that occur as the heart chambers contract and relaxcuspsEach valve consists of two or three of these fibrous flaps of tissue which are covered by endocardium