Summary
Summary Topic 7 Heart Rate
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Edexcel Biology Topic 7 Heart Rate, Sympathetic Nerve, Parasympathetic Nerve, ECG
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Control ofheart rate
Myogenic e conducts its own depolarisation .
SAN -depolarisation the atrial muscles
through causing
S.I units them to contract
More in the atrium than in he ventricles and opens
pressure
atrioventricular values
Held by AVN and conductive tissue
.
-
Depolarisation down bundle of this until apex of heart
depolarisation moves upthrough purlyne fibres
-
ventricle muscles contract
Pressure increase above atrium
closing values
atrioventricular
-
muscles and tendous the
papillary prevent opening
oher
way
.
Semilonar value opens
-
-
Auta pressure increases ,
elastic recoil , small lumen
↳ closes semilunar value
Stroke volume blood
heart beat
= volume of leaving left ventricle
per
Cardia c Output = stroke volume x heart rate
(dm3) (BPM)
EC6 Electrodes chest clean it contact
on arm and get good
-
, , .
R distance between two peaks
T
uni
PWave
P D .
mu to US
- repolarisation
Twave
s
Q
As
Time
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