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Ch. 9 Study Stack

TermDefinition
atrium upper right or left chamber of the heart
endocardium membrane lining the cavities of the heart
epicardium membrane forming the outer layer of the heart
interatrial septum partition between the right and left atria
interventricular septum partition between the right and left ventricles
myocardium heart muscle
pericardium protective sac enclosing the heart composed of two layers with fluid between
visceral pericardium layer of the pericardium closest to the heart
parietal pericardium outer layer
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 heart valve between the left atrium and the left ventricle
pulmonary valve heart valve opening from the right ventricle to the pulmonary artery
tricuspid valve valve between the right atrium and the right ventricle
arteries vessels that carry blood away from the heart to the arterioles
aorta large artery that is the main trunk of the arterial system branching from the left ventricle
arterioles small vessels that receive blood from the arteries
capillaries tiny vessels that join arterioles and venules
venules small vessels that gather blood from the capillaries into the veins
veins vessels that carry blood to the heart from the venules
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 from the pulmonary artery through the vessels in the lungs and back to the heart via the pulmonary vein, providing for the exchange of gases
blood pressure (BP) measure of the blood within the systemic arteries maintained by the force and rate of the heartbeat and the diameter and elasticity of arterial walls
diastole period during the cardiac cycle (complete heart beat) when blood enters the relaxed ventricles from the atria
systole period during the cardiac cycle (complete heart beat) when the heart is in contraction and blood is ejected through the aorta and the pulmonary artery
normotension normal blood pressure
hypotension low blood pressure
hypertension high blood pressure
sinoatrial (SA) node responsible for initiating electrical conduction of the heartbeat, causing the atria to contract and firing conduction of impulses to the atrioventricular (AV) node
Bundle of His neurological fibers extending from the AV node to the right and left bundle branches that fire the impulse from the AV node to the Purkinje fibers
Purkinje fibers fibers in the ventricles that transmit impulses to the right and left ventricles, causing them to contract
polarization resting state of a myocardial cell
depolarization change of a myocardial cell from a polarized (resting) state to a state of contraction
repolarization recharging of the myocardial cell from a contracted state back to a resting state
Created by: sheerinmansoor
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