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The Heart

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jenndouglas89's version from 2017-03-09 07:34

Section 1

Question Answer
Tough Inelastic membrane that prevents overstitching and adheres to the mediastinumFibrous pericardium
Thinner, more delicate membraneSerous Membrane
Part of serous membrane fused to fibrous pericardiumParietal layer
Part of serous membrane that adheres to the surface of the heartVisceral layer or epicardium
The epicardium is made of what type of tissueAdipose and fibroelastic
95% of the heart wall is made of what layer?Myocardium
The thin layer that lines the heart chambers and covers valves while reducing frictionEndocardium
Smaller superior chambers are?Atria
Large inferior chambers are? Ventricles
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Section 2

Question Answer
The right atrium receives blood from?Superior Vena Cava, Inferior vena cava, coronary sinus
The posterior wall of the RA is ? and the anterior is ?Smooth and rough ridges called pectinate muscles
The RA contains what valveTricuspid valve (right AV valve)
The ridges on the interior surface of the Right ventricle are calledTrabeculae carneae
Chordae tendineae arecords that attach to valve cusps (attached to heart muscle via papillary muscles
The RV contain what valvePulmonary semilunar valve
The Left Atrium receives blood from pulmonary veins
The anterior and posterior walls of the LA areSmooth
The LA contains what valveBicuspid valve
The Left Ventricle forms what?The apex of the heart and is the thickest heart chamber
The LV contains what valveAortic semilunar valve
The LV contains what like the RVChordae tendineae and papillary muscles
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Section 3

Question Answer
The atria have thinner walls becauseBlood only goes to ventricles
Ventricles have thicker walls becauseBlood goes to other parts of the body
Which ventricle is thinner...the left or rightright
What tissue is the fibrous skeleton made ofDense CT
The Dense CT encircles the?Valves and merges with the inter ventricular septum
Functions of the Fibrous SkeletonPrevents overstretching, attachment point for muscles, insulates electrical activity of heart
When the Atrioventricular valves open what happens?cusps protrude into ventricles causing Blood to flow from atria to ventricles
Atrioventricular valves close prior to ventricular contraction how and whydue to rise in pressure and chordae tenineae tightening as papillary muscles contract, preventing backflow
Semilunar valves are located between the Ventricles and great vessels
When do semilunar valves open?When pressure in ventricles rises causing ejection of blood
When do semilunar valves close?When pressure in ventricles falls
Since there are no valves guarding entry to atria what happens as atria contractThe vessels compress so no back flow occurs
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