Ex 28
number the following structures of the cardiac conduction system in the normal order of depolarization.
-AV bundle (of His) -AV node -Purkinje (conduction) fibers -Right and left bundle branches -SA node 1. SA node 2. AV node 3. AV bundle (of His) 4. Right and left bundle branches 5. Purkinje (conduction) fibers
Jaxton's heart rate is 68/min. What is the length of his cardiac cycle/sec?
0.88 sec
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)?
70 beats/min
Depolarization of the atria is associated with (the)
P wave
Depolarization of the ventricles is associated with (the):
QRS complex
A heart murmur is an abnormal heart sound due to a leaky valve
True
Bradycardia is a heartbeat below 60 beats/min
True
Fibrillation is defined as uncontrolled, rapid heart contractions
True
Repolarization of the atria is associated with the QRS complex
True
The T wave is characterized by repolarization of the ventricles.
True
the ECG records the electrical stimulation of cardiac muscle by the conduction system and not the contraction of the muscle itself
True
the heart beats without extrinsic stimulation from the ANS
True
Which of the following indicates the second heart sound and the valves that produce that sound?
dupp, semilunar valves
Which of the following indicates the first heart sound and the valves that produce that sound?
lubb, AV valves
Which heart sound is the loudest sound when auscultatedthe lubb or dupp? Why?
lubb. Blood is more turbulent because greater ventricular pressure closing AV valves
Bradycardia is a heartbeat above 100beats / m * i * n .
False
autorhythmic cells are located only in the interventricular septum
False
each heart chamber contracts separately, first the right atrium, then the right ventricle, left atrium, and left ventricle
False
the normal pacemaker of the heart is the AV node
False