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