chap2 EKG
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each of the black spaces below before clicking
on it to display the answer.
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| bundle of His(AV bundle) | conducts electrical impulese from the artia to the ventricles
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| sinoatrial (SA) node (pacemaker) | initiates heart at a rate of 60-100 beats per minute with electrical impulse that causes depolarization
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| atrioventricular (AV) node | delays the electrical impulse to allow for the atria to complet their contraction and ventricles to fill before the next contraction
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| bundle branches | conducts impulses down both sides of the interventricular septum
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| purkinje fibers (network) | distributes the electrical impulses through the right and left ventricles
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| cardiac cycle | the contraction and relaxation of the heart together make up the?
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| diastole | relaxation of heart, when blood fills the heart
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| systole | contraction of heart, when blood leaves the heart
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| semilunar valves | separate ventricles from arteries leading to lungs or body
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| aortic | semilunar valve, between left ventricle and aorta
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| pulmonary | semilunar valve, between rt. ventricle and pulmonary artery
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| tricuspid valve | valve located between the right atrium and right ventricle
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| mitral valve | atrioventricular valve between the left atrium and left ventricle
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| function of the heart | pump blood to and from all tissues of body, supplies nutrients and oxygen, remove carbon dioxide and waste products
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| top chambers of the heart | right and left atrium
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| bottom chambers of the heart | right and left ventricle
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| endocardium | inner layer, lines chambers and valves. were the purkinje fibers are located
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| myocardium | middle, thickest, responsible for contraction
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| epicardium | outside, thin kayer, contains coronary arteries, inner layer of pericardium
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| pericardium | double- layer sac encloses heart
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| interventricular septum | between right and left ventricle
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| automaticity | heat has its own innate ability to initiate an electrical impulse. works on its own.
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| conductivity | is the ability of the heart cells to recieve and transmit an electrical impulse. allows the electrical pulse.
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| contractility | ability of heat cells to shorten inresponse to an electrical stimulus. knows how much to use.
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| excitability | ability of the heart to respond to an impulse or stimulus. willing to accept stimulus.
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| left side | of heart pumps oxygenated blood to the body tissue.
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| right side | of the heart pumps deoxygenated blood to the lungs.
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| pulmonary circulation | transportation of blood to and from lungs
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| systemic circulation | transportation of blood between the heart and the rest of the body,excluding the lungs
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| coronary circulation | circulation supplies blood to and from the heart through the coronary arteries and cornary sinus.
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| 60-100 | average heart beats approximately
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| polarization | state of cellular rest in the heart
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| depolarization | cellular stimulation that causes the hear to contract
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| repolarization | cellular recovery that follows each contraction
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| isoelectic line | straight line, represents the period when no electrical activity is occuring in the heart.
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| cardiac cycle | contraction and relaxation period of the heart together make the?
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| ECG waveform includes | P wave, QRS complex,T wave
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