On an ECG isovolumetric contraction is represented by - ✔R
The AV node sends its impulse through the _______ into _______ - ✔→Bundle of His
→Purkinje Fibers
, IRENE GOLD BOARDS PART 1 PHYSIOLOGY NEW
2023-2024 A+ GRADED
The right Bundle of His is aka - ✔Moderator Band
How much faster is the Purkinje system than the Av node?
What accounts for this speed increase? - ✔→150x faster
→Faster because increased number of intercalated discs and gap junctions
The first downward or negative projection that is normal on an ECG is the ____ second
negative projection is - ✔→Q-wave - 1st
→S-wave - 2nd
On an ECG what hides atrial re-polarization? - ✔QRS complex
What prevents the AV valves from blowing backward during ventricular contraction? -
✔→Cordae Tendinea
→Papillary Muscles
Ventricular re-polarization is represented by what on an ECG? - ✔T-wave
Isovolumetric relaxation is represented by what on an ECG? - ✔S-T segment
What does a U-wave represent on an ECG? - ✔Papillary muscle re-polarization
A Myocardial infarction will be visualized as what on an ECG? (2 possibilities) -
✔Inverted T wave
Altered S-T segment
Heart tetany is prevented by what? - ✔→Slow calcium channels that create a long
absolute refractory period
→Aka "plateaus"
Heart auto- rhythmicity is due to what? - ✔The hearts own leaky sodium channels
Frequency of impulse:
SA - ✔SA - 80-100
Frequency of impulse:
AV - ✔AV - 40-60
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