Intrinsic Conduction system of the heart Flashcards
How does cardiac muscle contract, is it dependent or independent of the nervous system
independent
How can cardiac muscle tissue independtly contract
has its own intrinsic, nerve-like, electrical conduction system
What two systems can however alter the rate and strength of cardiac muscle contraction
Autonomic nervous system and endocrine
What is the primary specialised cell to the cardiac intrinsic conduction system
authorhythmic cell
The depolarisation of authorhythmic cells generates _____
action potential
How is the action potential produced by depolarisation delivered to surrounding cardiac muscle tissue
Directly or via extensions of the autorhythmic cells
what are the extensions of autorhythmic cells called
bundle branches/purkinje fibres
Which region is referred to as the pacemaker and what rhythm does this produce?
The SA node in the top right atrium and produces the sinus rhythm
what does the sinus rhythm determine
heart rate
Where is the AV node located
Bottom of the right atrium, just above the tricuspid valve
Pacemaker cells also known as
Autorythmic cells
Pacemaker cells are found where
SinoAtrial node/ SA Node
The SA nose is located where
Right atrium
Pacemaker cells have an unstable what which allows them to do what without a stimulus
Unstable membrane potential which allows them to depolarise
After the pacemaker cells have depolarised in the SA Node, where does the depolarisation spread to
Spreads via the internodal pathway to the AV Node
