Homework Clinic
Science Clinic => Health Science => Topic started by: notis on May 18, 2019
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After leaving the area of the AV node, impulses go through the ________ to reach the right and left bundle branches.
◦ AV junction
◦ Purkinje fibers
◦ SA node
◦ Bundle of His
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Bundle of His
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Part of the parasympathetic branch of the autonomic nervous system is the ________ nerve.
◦ pericardial
◦ aortic
◦ vagus
◦ coronary
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vagus
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When stimulated, the ________ branch of the nervous system increases heart rate, AV conduction, and irritability.
◦ parasympathetic
◦ pacemaker
◦ inherent
◦ sympathetic
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sympathetic
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Which cardiac cells are responsible for initiating and conducting pacemaker impulses?
◦ Motor cells
◦ Electrical cells
◦ Atrioventricular cells
◦ Mechanical cells
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Electrical cells
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Which is the normal pacemaker of the heart?
◦ SA node
◦ AV junction
◦ AV node
◦ Ventricle
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SA node
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Which of the following is NOT a part of the normal cardiac conduction system?
◦ Purkinje Fibers
◦ Coronary sinus
◦ Internodal pathways
◦ AV node
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Coronary sinus
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Thank you!
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Always glad to help...
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What is the term for the fail-safe mechanism that allows a lower pacemaker to take over when a higher site fails?
◦ Escape
◦ Irritability
◦ Polarization
◦ AV conduction
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Escape
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Which of the following best explains the mechanism called irritability?
◦ The normal pacemaker slows down and gives up control.
◦ The normal pacemaker changes its inherent rate.
◦ A lower pacemaker site speeds up to take control of the heart.
◦ The ventricles repolarize before they are ready.
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A lower pacemaker site speeds up to take control of the heart.
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Which of the following does NOT happen when the sympathetic branch is stimulated?
◦ Impulses go faster through the AV node.
◦ Heart rate increases.
◦ The heart becomes more irritable.
◦ Ventricular conduction slows down.
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Ventricular conduction slows down.
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When an EKG machine is turned on but not yet connected to the patient, the stylus produces a straight line called the ________ line.
◦ equal force
◦ isoelectric
◦ straight
◦ standard
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isoelectric
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The EKG machine produces an upright deflection on the graph paper if the flow of electricity is toward the ________ electrode.
◦ inverted
◦ positive
◦ straight
◦ negative
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positive
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The horizontal lines on the EKG graph paper measure:
◦ pattern.
◦ voltage.
◦ time.
◦ speed.
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voltage.
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The vertical lines on the EKG graph paper measure:
◦ voltage.
◦ time.
◦ pattern.
◦ speed.
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time.
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The distance between two "tic" marks is ________ sec.
◦ 3
◦ 5
◦ 4
◦ 6
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3
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On EKG graph paper, the time between two heavy vertical lines is five small boxes, or ________ sec.
◦ 0.20
◦ 0.04
◦ 0.12
◦ 0.08
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0.20
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On EKG graph paper, the distance in time between two light vertical lines, or across one small square, is ________ sec.
◦ 0.20
◦ 0.12
◦ 0.04
◦ 0.08
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0.04
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A series of cardiac cycles makes up a(n):
◦ EKG rhythm strip.
◦ wave segment.
◦ QRS complex.
◦ P-P interval.
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EKG rhythm strip.
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The deflections above and below the isoelectric line are referred to as:
◦ pauses.
◦ segments.
◦ intervals.
◦ waves.
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waves.
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The short period of electrical inactivity between the end of the P wave and the start of the QRS complex is called the:
◦ PR segment.
◦ PR pause.
◦ PR interval.
◦ P pause.
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PR segment.
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The PR interval begins at the first sign of the P wave and ends at the first sign of the next deflection, which is called the:
◦ S wave.
◦ QRS complex.
◦ T wave.
◦ PR segment.
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QRS complex.
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The PR interval reflects all ________ activity.
◦ mechanical
◦ ventricular
◦ atrial
◦ cardiac
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atrial
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Which of the following is NOT a normal QRS measurement?
◦ 0.06
◦ 0.11
◦ 0.08
◦ 0.20
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0.20
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No impulse can cause depolarization during the ________ refractory period.
◦ relative
◦ impulse
◦ absolute
◦ original
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absolute
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A strong impulse can cause a premature abnormal discharge during the ________ refractory period.
◦ absolute
◦ impulse
◦ relative
◦ original
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relative
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Which of the following best describes the elements of a single cardiac cycle?
◦ QRS complex, ST segment, and T wave
◦ P wave, PR segment, PR interval, QRS complex, and T wave
◦ P wave and QRS complex
◦ P wave, PR segment, and PR interval
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P wave, PR segment, PR interval, QRS complex, and T wave
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The heart's normal rhythm usually originates in the:
◦ atria.
◦ SA node.
◦ AV node.
◦ ventricle.
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SA node.
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To find out if a rhythm is regular or irregular, measure the ________ across the entire strip.
◦ PR intervals
◦ PR segments
◦ R-R intervals
◦ QRS complexes
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R-R intervals
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When a P wave originates in the SA node, it is expected to be smooth, rounded, and ________ in Lead II.
◦ biphasic
◦ notched
◦ inverted
◦ upright
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upright
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The standard systematic approach to arrhythmia interpretation consists of all of the following EXCEPT:
◦ P waves and PR interval.
◦ heart rate and regularity.
◦ QRS complex.
◦ refractory periods.
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refractory periods.
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The cardiac activity that takes place above the ventricles is referred to as ________ activity.
◦ AV nodal
◦ precipitating
◦ supraventricular
◦ infraventricular
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supraventricular
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If a rhythm is regular, the MOST accurate way to calculate heart rate is to count the number of small squares between two R waves and divide the total into:
◦ 150.
◦ 60.
◦ 1300.
◦ 1500.
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1500.
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P waves usually appear before:
◦ T waves.
◦ upright waves.
◦ QRS complexes.
◦ PR intervals.
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QRS complexes.
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Thanks
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Welcome :)
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A major EKG finding that can help you distinguish between supraventricular and ventricular rhythms is the width of the:
◦ P-P interval.
◦ T wave.
◦ P wave.
◦ QRS complex.
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QRS complex.
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A Normal Sinus Rhythm should have a QRS of less than ________ sec.
◦ 0.22
◦ 0.12
◦ 0.20
◦ 0.18
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0.12
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The QRS complex is indicative of ventricular ________ and thus should correspond to the patient's pulse.
◦ recovery
◦ depolarization
◦ failure
◦ irritability
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depolarization
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Which of the following is the LEAST accurate way to determine heart rate?
◦ Count the number of small squares between two R waves and divide that into 1500.
◦ Count the number of QRS complexes in a 6-sec strip and multiply by 10.
◦ Count the number of large squares between two R waves and divide that into 300.
◦ Use a rate meter.
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Count the number of QRS complexes in a 6-sec strip and multiply by 10.
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Which part of the conduction system has the slowest conduction speed, and is thus responsible for slowing down impulses until the heart is ready to receive them?
◦ SA node
◦ Atria
◦ Ventricles
◦ AV node
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AV node
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If a rhythm is IRREGULAR, the best way to determine rate is to:
◦ count the number of large squares between two R waves and divide that into 300.
◦ use a rate meter.
◦ count the number of small squares between two R waves and divide that into 1500.
◦ count the number of QRS complexes in a 6-sec strip and multiply by 10.
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count the number of QRS complexes in a 6-sec strip and multiply by 10.
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Thank you!
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Always glad to help...
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Which of the following best describes a "lost" P wave?
◦ One that is visible but highly irregular.
◦ One that is there one minute but gone the next.
◦ One that can't be counted because it happens too quickly.
◦ One that is obscured because it falls on other waves.
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One that is obscured because it falls on other waves.
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The P waves are the first waves you should look for when analyzing a rhythm strip because:
◦ they are usually very regular and thus easy to find.
◦ they are the biggest and thus most visible.
◦ they are the most important for diagnosing heart disease.
◦ they always have a constant relationship with the waves around them.
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they are usually very regular and thus easy to find.
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If a QRS complex measures less than 0.12 sec, you know that it did NOT originate in the:
◦ SA node.
◦ ventricles.
◦ AV junction.
◦ atria.
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ventricles.
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A rhythm that is "regularly irregular" would describe a rhythm that:
◦ is chaotic in its irregularity.
◦ is irregular sometimes but not others.
◦ is consistently irregular every time you see it.
◦ has a pattern to its irregularity.
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has a pattern to its irregularity.
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In Normal Sinus Rhythm, the heart rate is ________ bpm.
◦ 80-120
◦ 40-60
◦ 100-120
◦ 60-100
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60-100
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In Normal Sinus Rhythm, the PR interval must fall between ________ sec.
◦ 0.04-0.06
◦ 0.20-0.60
◦ 0.08-0.22
◦ 0.12-0.20
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0.12-0.20
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A Normal Sinus Rhythm has all of the following characteristics EXCEPT:
◦ QRS is less than 0.12 sec.
◦ the R-R intervals vary.
◦ heart rate is normal.
◦ P waves are uniform.
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the R-R intervals vary.
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The rate for Sinus Bradycardia is ________ bpm.
◦ between 60 and 100
◦ equal to 110
◦ less than 60
◦ more than 100
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less than 60
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The term "tachycardia" means:
◦ slow heart.
◦ normal heart.
◦ fast heart.
◦ sinus rhythm.
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fast heart.
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The rate for Sinus Tachycardia is ________ bpm.
◦ less than 80
◦ greater than 100
◦ less than 60
◦ 60-100
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greater than 100
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