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EKG--

wks 1&2

QuestionAnswer
`the upper chambers of the heart atria
the lower cahmber of the heart ventricle
base top of the heart
apex bottom of the heart
pericardium closed 2 layered sac that surrounds the heart
the smooth outer surface of teh heart epicardium
the thick middle layer of the heart myocardium
the innermost layer of the heart endocardium
tricuspid valve located between the right atrium and the right ventricle
chordae tendineae fine chords of dense tissue that attatch to papillary muscles in the wall of the ventricles
arteries thick walled and muscular blood vessels that function under high pressure to convey blood from the heart out to the rest of the body
coronary arteries carry oxygenated blood throughout the myocardium
veins blood vessels that carry blood back to the heart
superior vena cava drains blood from the head and neck
inferior vena cava collects blood from the rest of the body
capillaries tiny blood vessels that allow for the exchange of oxygen,nutrients,and waste products between the blood and the body
right atrium chamber that receives unoxygenated blood from the head, neck, and trunk
left atrium receives oxygenated blood form the pulmonary system
left ventricle receives oxygenated blood from the left atriuma nd pumps it to the body.
cardiac cycle represents the time form initiation of ventricular contraction initiation of the next ventricular contraction
systole ventricular contraction
diastole ventricular relaxation
stroke volume volume of blood pumped out of one ventricle of the heart in a single beat.
cardiac output amount of blood pumped by the ventricle in one minute
automaticity the ability of cardiac cells to generate their own electrical impulses spontaneously without external stimulation
excitability the ability of cardiac cells to repond to an electrical stimulus.
conductivity is the ability of cardiac cells to shorten and cause cardiac contraction in response to an electrical stimulus
sa node commonly referred to as the primary pacemaker of the heart because it normally depolarizes more rapidly than any other part of the conduction system.
internodal tracts distribute the electrical impulse throughout the atria and transmit the impulse from the sa node to the av node
av node located on the floor of the right atrium, the electrical activity is delayed appx 0.05 sec
av junction the region where the av node joins the bundle of his
bundle of his the conduction pathway that leads out of the av node
bundle branches two main branches that conduct electrical activity from the bundle of his down to the pukinje network
purkinje's network a network of fibers that carries electrical impulses directly to ventricular muscle cells
Created by: anewkirk