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32 Cards in this Set
- Front
- Back
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Diaphragm
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sheet of muscle essential for breathing. the muscle extends across the bottom of the rib cage nad is the principle muscle of reparation.
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layers of the Heart
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Fibrous Pericardium
Serous Pericardium |
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Serous Pericardium
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Parietal Layer
Visceral Layer Pericardial Cavity |
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Layers of The Heart
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Epicardium
Myocardium Endocardium |
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The Thickest layer is...
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Myocardium
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What Separates the Two Atria?
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Interatrial Septum
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What Separates the two centricles?
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Atrio-Ventricular Septum
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what vessels feed the heart tissue itself?
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culinary arteries
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How do papillary muscles play a role in which direction blood flows?
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it keeps blood flowing in one direction by controlling the opening and closing of the valves.
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why is there a difference in thickness among the walls of the ventricles?
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the right ventricles pumps blood to the lungs which requires a lower pressure, so its walls are thinner than the left ventricle which must pump the blood to the rest of the body
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Four Chambers
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Two Superior Atria
Two Inferior Ventricles |
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vessels entering right atrium
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Superior vena cava
inferior vena cava coronary sinus |
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superior vena cava
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from body
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inferior vena cava
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from budy
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coronary sinus
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from heart
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Vessels entering left atrium
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right and left pulmonary veins
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right and left pulmonary veins
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from lungs
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vessel leaving the right ventricle
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pulmonary trunk
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pulmonary trunk
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to lungs
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vessel leaving the left ventricle
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aorta
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aorta
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to body
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Atrioventricular (AV) Valves
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prevent backflow into the atria when ventricles contract
Tricuspid valve (Right) Mital Valve (Left) |
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Semilunar (SL) Valves
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Prevent Backflow into the nevtricles when ventricles relax
Aortic semilunar valve Pulmonary Semilunar valve |
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cardiac muscle cells
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striated, short, fat, branched, and interconnected
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intercalated discs
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junctions between cells
Desmosomes Gap Junctions |
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Desmosomes
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Anchor cardiac cells
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Gap junction
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allow passage of ions between cells
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intrinsic cardiac conduction system
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a network of noncontractile (autorhythmic) cells that initiate and distribute impulses to coordinate contraction of the heart
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ventricular filling
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takes pace in mid-to-late diastole
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cardiac cycle
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all events associated with bllod flow through the heart during one complete heartbeat
systole diastole |
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systole
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contraction
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diastole
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relaxation
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