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Anatomy/Elec/Mech❤

Anatomy electrical and mechanical of the heart

QuestionAnswer
Pericardium Outermost layer of the heart
Myocardium Middle layer of the heart, thickest part of the heart, where the electrical conduction lays in.
Atrium Holds and receives the supplies of blood
Right Atrium receives Deoxygenated blood
Left Atrium receives Oxygenated blood
Valves Prevents back flow, 1 way valve
Ventricles primary function is Main pumping chambers
Septals primary function Separates Left and Right sides of the heart to keep deoxygenated and oxygenated blood from mixing
Apex Lowest portion of the heart (tip)
Base Top part of the heart
Cardiac Conduction Pathway Blood Flow of the Heart
Lays inside the Myocardium Sino Atrial Node " SA Node "
Sino Atrial Node (SA Node) Primary Pacemaker
SA Node conducts a HR of 60-100 bpm
SA Node is located Upper part of the R Atrium close to the Superior Vena Cava
Atrial ventricular Node (AV Node) acts as Secondary Pacemaker
Av Node conducts a HR of 40-60 bpm
AV Node holds and Slows down electrical impulses
Bundle of HIS "AV Bundle" function is To separate Impulses
Purkinjie Fibers Tertiary Pace Maker
Purkinjie Fibers distributes Impulses to the ventricles. 20-40 HR
Myocardial cells have what two phases Electrical and mechanical
Depolarization = Contraction = systolic
Repolarization = Return to relax = diastolic
Polarization= Full rest
Automaticity Rhythmic, impulse of the heart, SA node
Excitability Respond and react to other cells
Conductivity Relays impulses to the neighboring cells
Contractility Cells contract
From the P wave to the end of the cardiac cycle represents Action Potential,(Depolarization) &Repolarization
The end of the t-wave to the beginning of the Next Cycle Re-factory Period (Polarization)
Electrical proceeds Mechanical
Layer beneath the pericardium. The serious membrane that forms the innermost layer of the pericardium and the outer surface of the heart Epicardium
Electrical Phases Depolarization, Repolarization
Mechanical phases Systolic, Diastolic
Created by: Georgia1984
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