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