31 terms

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aorta
the largest artery in the body which transports blood from the left ventricle of the heart to the entire body
aortic semilunar valve
valve located in the aorta that prevents backflow of blood into the left ventricle
atrioventricular (av) node
specialized cells that delay the electrical conduction through the heart & allow the atria time contract
atruim
one of the upper 2 small chambers of the heart. the right atruim receives blood from the body through the vena cava and the left atruim receives blood from the lungs through the pulmonary vein
automaticity
the ability of a cardiac cell to initiate an electrical impulse, without being stimulated by anther source, causing a cardiac contraction
bundle branches
left and right branches of the bundle of his that conduct impulses down either side of the interventricular septum to the left and right ventricles
bundle of his
a bundled of fibers that orginate in the av node and enter the interventricular septum conducting electrical impulses to the left and right bundle branches
cardiac cycle
the period from the beginning of one heartbeat to the beginning of the next: the cardiac cycle is made up of the systole and diastole
conductivity
the ability of the heart cells to recieve and transmit an electrical impulse
contractility
the ability of the heart muscle cells to shorten in responce to an electrical stimulas
coronary circulation
the circulation of the blood to and from the heart muscle
deoxygenated blood
blood that has a little or minimal oxygen
depolarization
the electrical activation of the cells of the heart that initias contraction of the heart muscle
diastole
the phase of the cardiac cycle when the heart is expanding and refilling also know as the relaxtion phases
excitability
the ability of the heart muscle cells to respond to an impulse or stimulas
interval
the period of time between two activities within the heart
interventricular septum
a portion or wall (septum) that divides the right and left ventricles
ischemia
lack of blood supply to an area of tissue due to blockage in the circulation to that area
isoelectric
the period when the electrical tracing of the ekg is at zero or a straight line no postive or negative deflections are seen
left atruim
the loeft upper chamber of the heart which recieves blood from the lungs
left ventricle
the left lower chamber of the heart which pumps oxygenated blood through the body. it is the biggest and strongest chamber know as the workcourse of the heart
mitral (bicuspid valve)
valve with 2 cusps located between the left atruim and left ventricle it prevents backflow of blood into the left atruim
myocardial
a blackage of one or more of the cornoary artieries causing lack of oxygen to the <3 and damage the muscle tissue
oxygentated blood
blood having an oxygen
pericardium
a 2 layered sac of tissue enclosing the heart
polarization
the state of cellur rest in which the inside is negatively charged and the outside is positivitly charged
pulmonary artery
the largest artery that transport deoxygenated blood from the right ventricle to the lungs during pulmonary circulation
pulmonary circulation
the transportation of blood to and from the lungs : blood of oxygenated in the lungs during pulmonary circulation
pulmonary semilunar valve
a valve found in the pulmonary artery that prevents blood flow of blood into the right ventricle during pulmonary circulation
pulmonary vein
a blood vessel that transports blood from the lungs to the left atruim. the only vein that carrys oxygenated blood
pulmonary fibers
the fibers within the heart that distribute electrical impulses from cell to cell throughout the ventricles