Multiple Choice
Use the following answer code to indicate which factor involved in the initiation and spread of cardiac excitation is being identified.
-Has the fastest rate of pacemaker activity.
A) SA node
B) AV node
C) Bundle of His and Purkinje system
D) Gap junctions
Correct Answer:
Verified
Correct Answer:
Verified
Q127: Sympathetic stimulation increases the heart rate.
Q128: Compare a stenotic and insufficient valve.
Q128: Pacemaker activity by the Purkinje fibers is
Q129: The chordae tendineae<br>A) keep the AV valves
Q131: The action potential spreads through the atria
Q133: If the EDV were held constant, increased
Q134: The term diastole means<br>A) closure.<br>B) conduction.<br>C) contraction.<br>D)
Q135: Sympathetic stimulation increases contractile strength by:<br>A) decreasing
Q137: Funny channels open when the membrane potential
Q151: The normal pacemaker of the heart is