Cardiac conduction system Flashcards
list down the properties of Cardiac muscle
1- automaticity/ rhythmicity
2- conductivity
3-excitability
4- contractility
The ability of heart to beat spontaneously and regularly is known as_______
A- automaticity/ rhythmicity
B- conductivity
C-excitability
D- contractility
A- automaticity/ rhythmicity
The ability of the heart to transmit excitation wave is known as______
A- automaticity/ rhythmicity
B- conductivity
C-excitability
D- contractility
B- conductivity
The ability of the heart to receive adequate stimulus is known as______
A- automaticity/ rhythmicity
B- conductivity
C-excitability
D- contractility
C-excitability
The ability to contract and to pump the blood into circulatory system is known as______
A- automaticity/ rhythmicity
B- conductivity
C-excitability
D- contractility
D- contractility
list down the components of the cardiac conduction system
1- SA NODE
2- AV NODE
3- BUNDLE OF HIS
4- LEFT AND RIGHT BUNDLE BRANCHES
5- PURKINJ FIBERS
SA node is known as the “ heart natural pacemaker”_____
true
false
TRUE
where is the SA node located
superior lateral wall of right atrium near the superior vena cava
what is the function of SA node
initiates the electrical impulse that causes the atria to contract and SETS THE HEART RATE
the normal heart rate is ____ beats/min
A- 70-120
B- 50-80
C-60-100
D- 60-120C
C- 60-100
what is the name of the tracts that connects the SA node and AV node
internodal tracts
list the name of the 3 internodal tracts
- anterior
- middle
- posterior
the only conducting pathway between the atria and ventricles is called
AV node
where is the av node located
posterior septal wall of right atrium behind tricuspid valve
what is the function of the AV node
it delays to ensure the ventricle is filled up before contracting
the delay that happens at the AV node is called
Nodal delay
what happens if the SA node got damaged
the AV node acts as a pacemaker but generate slower impulses
what is the function of bundle of his
group of fibers that carries electrical impulses from the Av node to ventricles
where is the bundle of his located
originates from Av node then travels down through the interventricular septum and divides into the right and left bundle branches, which continue down the septum toward the ventricles.
the left branch divides into
anterior and posterior fasciculus
known as the fastest and largest conducting fiber
purkinje fibers
location of purkinje fiber
spread throughout ventricular walls
function of purkinje
conduct the electrical impulse rapidly, ensuring coordinated ventricular depolarization and contraction, which is essential for efficient blood pumping
where do the purkinje fibers pass the impulse
to ventricular myocytes in ventricular walls
