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chap2 EKG

QuestionAnswer
bundle of His(AV bundle) conducts electrical impulese from the artia to the ventricles
sinoatrial (SA) node (pacemaker) initiates heart at a rate of 60-100 beats per minute with electrical impulse that causes depolarization
atrioventricular (AV) node delays the electrical impulse to allow for the atria to complet their contraction and ventricles to fill before the next contraction
bundle branches conducts impulses down both sides of the interventricular septum
purkinje fibers (network) distributes the electrical impulses through the right and left ventricles
cardiac cycle the contraction and relaxation of the heart together make up the?
diastole relaxation of heart, when blood fills the heart
systole contraction of heart, when blood leaves the heart
semilunar valves separate ventricles from arteries leading to lungs or body
aortic semilunar valve, between left ventricle and aorta
pulmonary semilunar valve, between rt. ventricle and pulmonary artery
tricuspid valve valve located between the right atrium and right ventricle
mitral valve atrioventricular valve between the left atrium and left ventricle
function of the heart pump blood to and from all tissues of body, supplies nutrients and oxygen, remove carbon dioxide and waste products
top chambers of the heart right and left atrium
bottom chambers of the heart right and left ventricle
endocardium inner layer, lines chambers and valves. were the purkinje fibers are located
myocardium middle, thickest, responsible for contraction
epicardium outside, thin kayer, contains coronary arteries, inner layer of pericardium
pericardium double- layer sac encloses heart
interventricular septum between right and left ventricle
automaticity heat has its own innate ability to initiate an electrical impulse. works on its own.
conductivity is the ability of the heart cells to recieve and transmit an electrical impulse. allows the electrical pulse.
contractility ability of heat cells to shorten inresponse to an electrical stimulus. knows how much to use.
excitability ability of the heart to respond to an impulse or stimulus. willing to accept stimulus.
left side of heart pumps oxygenated blood to the body tissue.
right side of the heart pumps deoxygenated blood to the lungs.
pulmonary circulation transportation of blood to and from lungs
systemic circulation transportation of blood between the heart and the rest of the body,excluding the lungs
coronary circulation circulation supplies blood to and from the heart through the coronary arteries and cornary sinus.
60-100 average heart beats approximately
polarization state of cellular rest in the heart
depolarization cellular stimulation that causes the hear to contract
repolarization cellular recovery that follows each contraction
isoelectic line straight line, represents the period when no electrical activity is occuring in the heart.
cardiac cycle contraction and relaxation period of the heart together make the?
ECG waveform includes P wave, QRS complex,T wave
Created by: jasra
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