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Heart - How it Works


What happens during Atrial Relaxation? Blood ENTERS both Atria
What happens during Atrial Contraction? Blood LEAVES both Atria
What happens during Ventricular Contraction? Blood LEAVES Ventricles
What happens during Ventricular Relaxation? Blood FILLS Ventricles
What is Diastole? Atrial Contraction, Ventricular Relaxation
What is Systole? Atrial Relaxation, Ventricular Contraction
What is happening during Systole? AV Valves = CLOSED, SL Valves = OPEN - "LUB"
What is happening during Diastole? AV Valves = OPEN; SL Valves = CLOSED - "DUB"
Where are AV Valves located? between the Atria and Ventricles
Where are the SL Valves located? between Ventricles and Arteries
What causes heart murmurs? Valves not opening/closing properly - may be some regurgitation
What is the composition of Heart Valves? Endothelium = Simple Squamous Epithelium
What is the function of AV Valves? prevent Regurgitation into Atria
What is the function of SL Valves? prevent Regurgitation into Ventricles
When is the "Lub" sound created? AV Valves = CLOSED - Systole
When is the "Dub" sound created? SL Valves = CLOSED - Diastole
What is the function of the Sinoatrial Node? sets Contractile Pace for both Atria
Where is the Sinoatrial Node located? Superior portion of RIGHT Atrium
What is the function of the Atrioventricular Node? accepts Electrical Excitation from Atria
Where is the Atrioventricular Node located? on LOWER Interatrial Septum
What is the function of the Atrioventricular Bundle (bundle of His)? Spreads Excitation through Ventricular Walls via the conduction Myofibers (Purkinje Fibers)
Where is the Atrioventricular Bundle (Bundle of His) located? on LOWER Interatrial Septum - connected to AV Node
What is the role of the Vagus nerve w/ regard to the heart? Heart rate is SUPRESSED by the Parasympathetic Vagus nerve
What structures(s) are responsible for accelerating the Heart Rate? Sympathetic Nerves ( T-1 --> T-5 )
What effect would cutting the Vagus nerve have on the Heart? would Increase the Heart Rate
How is coordination and control of the heart set? Sinoatrial Node --> Atrioventricular Node --> Atrioventricular Bundle --> Myofibers --> Ventricular Walls = Heart Rate
What is an anatomical difference between AV and SL Valves? the flaps of AV Valves are restrained by Chordae Tendineae
What structures control the Chordae Tendineae? Papillary Muscles = extensions of Myocardium
What is the function of Chordae Tendineae? restrain flaps of AV Valves
Created by: kristel387