Ex 28 RYK - Practice PDF

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Name ___________________________________ Date _________________

Section ______________________________

Reviewing Your Knowledge

E X E R C I S E

28 A. Heart Sounds Fill in the blank with the correct term. 1. The first heart sound heard is _______________ that is due to blood hitting against the _______________ valves. 2. The second heart sound heard is _______________ that is due to blood hitting against the _______________ valves. 3. What is a heart murmur? 4. Which heart sound is the loudest sound when auscultated, the lubb or dupp? Why? 5. Valerie’s radial pulse rate is 70/min. Assuming her heart and arteries are in good health, what is her approximate heart rate (beats/min)? 6. Jaxton’s heart rate is 68/min. What is the length of his cardiac cycle in seconds?

B. Electrical Conduction System of the Heart Circle True or False for the following questions. 1. The heart beats without extrinsic stimulation from the autonomic nervous system. True or False 2. Autorhythmic cells are located only in the interventricular septum. True or False 3. Each heart chamber contracts separately, first the right atrium, then the right ventricle, left atrium, and left ventricle. True or False 4. The ECG records the electrical stimulation of cardiac muscle by the conduction system and not the contraction of the muscle itself. True or False 5. The normal pacemaker of the heart is the AV node. True or False 6. Number the following structures of the cardiac conduction system in the normal order of depolarization (1 to 5). _______________ AV bundle (of His) _______________ AV node _______________ Purkinje (conduction) fibers _______________ Right and left bundle branches _______________ SA node

EXERCISE 28 CARDIAC CYCLE

C. Electrocardiography Match the following descriptions with the correct terms. A term may be used more than once. bradycardia fibrillation P wave QRS complex T wave tachycardia 1. depolarization of the atria 2. depolarization of the ventricles 3. fast heart rate above 100 beats/min 4. repolarization of the atria 5. repolarization of the ventricles 6. slow heart rate below 60 beats/min 7. uncontrolled, rapid heart contractions Measurements Using the ECG

Using the ECG tracing in Figure 28.4(b), calculate the: 8. QRS complex length: __________________ sec 9. P-Q interval: __________________ sec 10. Q-T interval: __________________ sec 11. Heart rate: __________________ beats/min...