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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

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