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A&P CH13 key terms

A&P CH13 Cardiovascular System

arteriole a small branch of an artery that communicates with a capillary network
atrium chamber of heart that receives blood from veins
capillary a small blood vessel that connects an arteriole and a venule
cardiac conduction system system of specialized cardiac muscle fibers that conducts cardiac impulses from the S-A node into the myocardium
cardiac cycle a series of myocardial contractions and relaxations that constitutes a complete heartbeat
cardiac output the volume of blood per minute pumped by the heart (calculated by multiplying stroke volume in milliliters by heart rate in beats per minutes
diastole phase of the cardiac cycle when a heart chamber wall relaxes
electrocardiogram (ECG a recording of the electrical activity associated with the heartbeat
endocardium inner lining of the heart chambers
epicardium the visceral portion of the pericardium on the surface of the heart
functional syncytium merging cells performing as a unit; those of the heart are joined electrically
myocardium muscle tissue of the heart
pericardium serous membrane that surrounds the heart
peripheral resistance resistance to blood flow due to friction between the blood and the walls of the blood vessels
pulmonary circuit system of blood vessels that carries blood between the heart and the lungs
systemic circuit the vessels that conduct blood between the heart and all body tissues except the lungs
systole phase of the cardiac cycle when a heart chamber wall contracts
vasoconstriction a decrease in the diameter of a blood vessel
vasodilation an increase in the diameter of a blood vessel
ventricle a cavity, such as brain ventricles filled with cerebrospinal fluid, or heart ventricles that contain blood
venule a vessel that carries blood from capillaries to a vein
viscosity the tendency for a fluid to resist flowing due to the internal friction of its molecules