L14: Heart rate and its regulation Flashcards
1
Q
what does vagal tone mean ?
A
sympathetic and parasympathetic predominantly supply vagus nerve at rest
2
Q
what does vagal escape mean ?
A
absence of vagal fibers supplying ventricles of the heart
3
Q
the SAN has a firing rate of 100bpm but the heart rate is less , at about 75bpm , why is that ?
A
due to predominant vagal tone on SAN
4
Q
what is tachycardia ?
A
> 90 BPM Heart rate
5
Q
what is bradycardia ?
A
<60 BPM heart rate
