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Lecture

BIO120H1 Lecture Notes - Hypertrophy, Pulmonary Artery, Aorta


Department
Biology
Course Code
BIO120H1
Professor
Jean Jiang Nash

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1/13/2013 9:39:00 AM
The heart has an endogenous pacemaker that sets the electrical rythem
The pace maker is found in the sinosatrial node in the right atria
The cells don’t have a resting potential, so these cells send signals
through a conduction system-internodal pathways-(role to conduct
elec, not to contract) which goes to the contractile muscles and
cause heart to contract
There is ony one point where the electrical pathway can move from
the atria to the ventricles and the is the AV
After the wave of depol. Hits the AV, then it travels down to the
right and left bundle branches and to the purkunje fibres which
cause heart to contract
The purkunje fibres go upwards causing the contraction to take
place from the bottom up, this is important for coordination of
pumping to the aorta or the pulmonary artery
Gap junctions are important because it causes rapid conduction of currents,
no neurotransmitter is released
Hypertrophy; growth of the muscle; heart loses ability to pump effeciently
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