Intro And Electrophysiology Flashcards
what are the layers of the pericardial sac?
Parietal- outer fibrous layer
Visceral- inner layer
Pericardial fluid- lubricates the 2 layers
What are the 3 layers of the heart wall?
Epicardium- thin serous membrane on outer surface
Myocardium-muscular middle layer
Endocardium- thin serous membrane lining inner chambers
What are the 2 types of cells in the heart?
Myocardial cells with contractile ability
Conducting cells- pacemakers and the electrical conducting cells (bundle branches and purkinje fibers)
What are the points of contact between two myocardial cells called?
Intercalated discs
______ _________ in the intercalated disks permit rapid conduction of electrical impulses from one cell to the next
Gap Junctions
Myocytes all contract together as a single unit when stimulated. _________ hold the cells together during contraction
Desmosomes
What is the structure that electrically insulates the atria from the ventricles?
The cardiac skeleton/plate of fibrous connective tissue
Cardiac output= ______ X ______
CO= HR x SV
Where are baroreceptors located
Aorta
Carotid
The parasympathetic nervous system (slows/raises) the heart rate using (acetylcholine/epinephrine)
Slows
Acetylcholine
What are the 4 key properties of myocardial cells?
Automaticity- ability of certain cells to produce an electrical impulse independently
Excitability- ability to respond to an electrical stimulus
Conductivity- ability to transmit an electrical stimulus from cell to cell
Contractility- ability to contract when electrically stimulated
she had this in red
The ________ is the heart’s primary pacemaker, and its intrinsic rate is ____-____bpm.
SA node
60-100
The _________ acts as a ~gatekeeper~ for impulses reaching the ventricales by conducting impulses more slowly
AV node
***she said this like 3278y56789346 times
The (left/right) bundle branch branches into anterior and posterior fascicles to reach even father
Left
The intrinsic rate of the Purkinje fibers is _________ bpm
20-40