Exam 2 Ch 13 Flashcards
SA node
pacemaker
AV node
delays ventricular signal
Spontaneous rhythmicity
special heart cells generate and spread electrical signal
SA node
AV node
AV bundle
Purkinje fibers
How does electrical signal spread
via gap junctions
Initiates contraction signal
SA node
How does the signal spread from SA node to AV node
Via RA/La
Delays, relays signal to venticles
AV node
how is extrinsic control of the heart with parasympathetic nervous system get to the heart
Vagus nerve
cranial nerve X
What is intrinsic HR
100 beats per minute
What is normal resting heart rate
60-100 bpm
What do elite endurance athletes usually have for heart rate
30 bpm
sympathetic
fight or flight
parasympathetic
rest and digest
ECG (electrocardiogram)
recording of hearts electrical activity
P wave
atrial depolarization