protective sac enclosing the heart composed of two layers with fluid between
visceral pericardium
layer closest to the heart (visceral = pertaining to organ)
parietal pericardium
outer layer (parietal = pertaining to wall)
pericardial cavity
fluid-filled cavity between the pericardial layers
ventricle
lower right or left chamber of the heart
heart valves
structures within the heart that open and close with the heartbeat to regulate the one-way flow of blood
aortic valve
heart valve between the left ventricle and the aorta
mitral valve
bicuspid valve
heart valve between the left atrium and left ventricle (cuspis = point)
pulmonary semilunar valve
heart valve opening from the right ventricle to the pulmonary artery (luna = moon)
tricuspid valve
valve between the right atrium and the right ventricle
valves of the veins
valves located at intervals within the lining of veins, especially in the legs, which constrict with muscle action to move the blood returning to the heart
arteries
vessels that carry blood from the heart to the arterioles
aorta
large artery that is the main trunk of the arterial system branching form the left ventricle
arterioles
small vessels that receive blood from the arteries
capillaries
tiny vessels that join arterioles and venues
venules
small vessels that gather blood from the capillaries into the veins
veins
vessels that carry blood to the heart from the venues
systemic circulation
circulation of blood throughout the body via arteries, arterioles, capillaries, venules, and veins, to deliver oxygen and nutrients to body tissues
coronary circulation
circulation of blood through the coronary blood vessels to deliver oxygen and nutrients to the heart muscle tissue
pulmonary circulation
circulation of blood form the pulmonary artery through the vessels in the lungs and back to the heart via the pulmonary vein, providing for the exchange of gases