Lab 2 - CV System Flashcards
what type of regulation is the SA node under
nervous regulation
what does sympathetic activation lead to
increased heart rate due to increased Na+ leakage shortening potential drift
what does parasympathetic activation lead to
decreased heart rate due to increased K+ permeability
what occurs to maintain coordination between atrial and ventricular contraction
the sympathetic input proportionally increases the velocity of the AV node which reduced lag in conduction
what does the shape and completeness of the ECG print depend on
number and position of electrodes
what is the resultant vector
summation of individual currents from individual cells
what happens to the resultant vector as the depolarization wave progresses
it rotates
what does P represent
atrial depolarization
what is the PQ interval
time taken by the AP to pass the AV node
what does QRS represent
ventricle depolarization
what does T represent
ventricle repolarization
