nd fibrillation of the QRS complex, P-R interval, and Q-T interval laboratory pe
ID: 3505824 • Letter: N
Question
nd fibrillation of the QRS complex, P-R interval, and Q-T interval laboratory period, and recognize normal values in the ECG observed during experimental th holding. Pre-Lab Quiz 1. Circle True or False. Cardiac muscle cells are electrically connected by gap junctions and behave as a single unit. 2. Because it sets the rate of depolarization for the normal heart, the node is known as the pacemaker of the heart. b. Purkinje a. atrioventricular c. sinoatrial 3. Circle True or False. Stimulation by the nerves of the autonomic nervous system is essential for cardiac muscle to contract. 4. Today you will create a graphic recording of the electrical changes that occur during a cardiac cycle. This is known as an: a. electrocardiogram b. electroencephalogram c. electromyogram 5. Circle the correct underlined term. The typical ECG has three /six normally recognizable deflection waves. 6. In a typical ECG, the wave signals the depolarization of the atria immediately before they contract c. R d. T a. P 7. Circle True or False. The repolarization of the atria is usually masked by 8. Circle the correct underlined term. A heart rate over 100 beats/minute is 9. How many electrodes will you place on your subject for today's activity if b. Q the large QRS complex known as tachycardia/bradycardia. c. 10 d. 12 0. Circle True or False. ECG can be used to calculate heart rate. you use a standard ECG apparatus? a. 3 b. 4Explanation / Answer
1. True. Cardiac muscle cells are electrically connected by gap junctions and behave as a single unit.
2. Because it sets the rate of depoarisation for normal heart, the "SINOATRIAL " node is known as the pacemaker of the heart.
3. False: stimulation by the autonomic nervous system can increase and decrease the heart beat.
4. Electrocardiogram: test that measures the activity of heart .
5. The typical ECG has three deflection waves that reflect the current associated with the left and right ventricular depolarisation.
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