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39 Cards in this Set
- Front
- Back
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which system of noncontractile cardiac cells helps the heart to contract in a coordinated and independent manner?
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intrinsic conduction system
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which system modifies the rate of the heart through its sympathetic and parasympathetic divisions?
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autonomic nervous system
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list the components of the intrinsic conduction system in order...
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Sinoatrial (SA) node
-Atrioventricular (AV) node -Atrioventricular (AV) bundle -right and left bundle branches -purkinje fibers |
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which intrinsic condition system structure is referred to as the "pacemaker" and why?
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SA Node; because it is made of self stimulating, conducting cells that stimulate the contractory cells to beat, setting the cells that stimulate the contractory cells to beat, setting the pace
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what is an electrocardiogram?
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a graphic record of heart activity (electrical changes in the heart)
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what are the three primary waves on the ECG?
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-P Wave
-QRS Complex -T Wave |
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P wave represents...
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results from movement of the depolarization wave from the SA node through the atria
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QRS complex represents...
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results from ventricle depolarization and precedes ventricle contraction
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T Wave represents...
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caused by ventricular repolarization and typically lasts about 16 seconds
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give the normal length of the PR interval, the QRS interval and the QT interval
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PR: .16 s
QRS: .08 s QT: .38 s |
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each square on an ECG equals how many seconds?
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0.04 seconds
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what changes are seen in the ECG during breath holding?
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the R wave gets smaller and less defined
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why can heart valve abnormalities be detected more accurately by auscultation than by electrocardiography?
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because an ECG measures electricle impulses and auscultation focuses specifically on the closing of the valves
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what does the "Lub" of the heart sounds represent?
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the closing of the AV valve, signifies the point when ventricle pressure rises above atrial pressure
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what does the "Dub" of the heart sounds represent?
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the SL valves snapping shut, at the beginning of ventricular relaxation
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describe where the mitral valve can be best auscultated...
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over heart apex, in 5th intercostal space in line with middle of clavicle
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describe where the tricuspid valve can be best auscultated...
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(typically) right sternal margin of the 5th intercostal space
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describe where the aortic semilunar valve can be best auscultated...
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2nd intercostal space at right sternal margin
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describe where the pulmonary semilunar valve can be best auscultated...
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2nd intercostal space at left sternal margin
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define "pulse"
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rhythmic expansion and recoil of arteries resulting from heart contraction
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in general, where are pulses most easily felt?
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where the radial arter surfaces at the wrist; the radial pulse
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what is the best way to palpate (feel) a pulse?
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by compressing the artery against firm tissue
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where is the COMMON CAROTID ARTERY pulse found?
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side of the neck
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where is the BRACHIAL ARTERY pulse found?
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inside of the upper arm
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where is the TEMPORAL ARTERY pulse found?
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side of the head by your hairline
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where is the RADIAL ARTERY pulse found?
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palm side of the wrist
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where is the FACIAL ARTERY pulse found?
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right below the jaw
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define blood pressure...
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the force per unit area exerted on a vessel wall by the contained blood
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what does systolic pressure measure?
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the contraction period of the heart beat
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what does diasolic pressure measure?
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the relaxation period of the heart beat
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if a person's blood pressure is 120/80, what is the systolic and diastolic pressure?
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120 and 80, respectively
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what are sounds of Korotkoff?
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soft tapping sounds heard while taking blood pressure
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what causes the sounds that are heard at the systolic pressure?
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the first heart beat
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what causes the sounds that are heard at the diastolic pressure?
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the lack of sound of heart beating
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define hypertension...
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high blood pressure: known as the "silent killer"
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define hypotension...
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low blood pressure
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we used a ______ to monitor our heart rate and oxygen intake levels
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pulse oximeter
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why would a pulse oximeter be vital in monitoring stroke patients?
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if they dont get enough oxygen, that means the heart isn't functioning properly
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what did we use to find blood pressure?
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a sphygmomanometer
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