LAB 05 THE Cardiac Cycle Spring \'19 PDF

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Download LAB 05 THE Cardiac Cycle Spring '19 PDF

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LAB 05 Corresponding text material:

THE CARDIAC CYCLE Amerman pp. 644 - 661

OBJECTIVES: 1. To define the following terms: ___ cardiac cycle ___ cardiac (or intrinsic) conduction system ___ sinoatrial node ___ atrioventricular node ___ pacemaker ___ systole

___ diastole ___ electrocardiogram ___ fibrillation ___ arrhythmia ___ myocardial infarction

2. List the elements of the cardiac (or intrinsic) conduction system in order. 3. To describe the major events of a cardiac cycle 4. To draw a normal ECG wave form representing one heartbeat and label the following: ___ P wave ___ QRS complex ___ T wave ___ P-R interval ___ S-T segment ___ Q-T interval 5. To describe the phases of a cardiac cycle represented by each part of a normal ECG pattern.

PART 1 – DEFINITIONS Define each of the following terms: Term

Definition

cardiac cycle intrinsic conduction system sinoatrial node atrioventricular node pacemaker systole diastole electrocardiogram fibrillation arrhythmia myocardial infarction PART 2 - THE CARDIAC CYCLE The events of one complete heartbeat are referred to as the cardiac cycle. The contraction of the ventricles is referred to as (1)_______________ and the period of ventricular relaxation is called (2)_______________. The monosyllables describing heart sounds during the cardiac cycle are (3)_______________. The first heart sound is the result of closure of the (4)_______________ valves; closure of the (5) _______________ valves causes the second heart sound. The heart chambers that have just been filled when you hear the first heart sound are the (6) _______________ and the chambers that have just emptied are the (7)_______________. Immediately after the second heart sound, the (8)_______________ are filling with blood and the (9)_______________ are empty. Abnormal heart sounds, or (10)_______________, usually indicate valve problems.

PART 3 - THE INTRINSIC CONDUCTION SYSTEM Locate and label the following structures in the figure: 1. right atrium 6. sinoatrial (SA) node 2. left atrium 7. bundle branches 3. interventricular septum 8. atrioventricular (AV) node 4. superior vena cava 9. Purkinje fibers 5. bundle of His (AV bundle)

Use a colored pencil or pen to indicate the pathway that impulses take through this conduction system. List the elements of the intrinsic conduction system in order starting from the SA node. SA node  ____________________  _____________________  ____________________  ______________________

Describe what happens in the cardiac cycle in the following situations: 1. during the P wave_________________________________________________________________ 2. immediately after the P wave ________________________________________________________ 3. immediately after the P wave ________________________________________________________ 4. during the QRS wave_______________________________________________________________ 5. immediately after the QRS wave (S-T interval)__________________________________________ 6. during the T wave_________________________________________________________________...