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25 Cards in this Set
- Front
- Back
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Which structure returns blood to the right atrium? |
Coronary sinus, inferior vena cava, and superior vena cava |
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The valve located between the right atrium and the right ventricle is the |
Tricuspid valve |
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The papillary muscles |
Are attached to chordae tendineae |
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List the vessels in order a red blood cell would encounter them going from the systemic veins to the systemic arteries |
- inferior vena cava - pulmonary trunk - pulmonary vein - aorta |
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The bulk of the heart wall is |
Myocardium |
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Cardiac muscle has |
Sarcomeres, a SR, transverse tubules, and many mitochondria |
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APs pass from one cardiac muscle cell to another through |
Gap junctions |
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During the transmission of APs through the conducting system of the heart, there is a temporary delay at the |
AV node |
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Arrange the structures in order that an AP passes through them |
- SA node - AV node - atrioventricular bundle - bundle branches - purkinje fibers |
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Purkinje fibers |
Are specialized cardiac muscle cells |
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T waves on a ECG represent |
Repolarization of the ventricles |
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The greatest amount of ventricular filling occurs during |
The first 1/3 of diastole |
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While the SL valves are open during a normal cardiac cycle, the pressure in the left ventricle is |
Higher than the pressure in the aorta |
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Blood flows neither into nor out of the ventricles during |
The period of isovolumetric contraction and the period of isovolumetric relaxation |
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Stroke volume is the |
Difference between end-diastolic and end-systolic volume |
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Cardiac output is |
HR × SV |
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Pressure in the aorta is at its lowest |
Just before the SL valves open |
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The after the dicrotic notch on the aortic pressure curve, |
The pressure in the aorta is greater than the pressure in the left ventricle |
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The LUBB sound is caused by the |
Closing of the AV valves |
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Increased venous return results in |
Increased SV and increased CO |
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Parasympathetic nerve fibers are found in the ________ nerves and release _________ at the heart |
Vagus, ACh |
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Increased parasympathetic stimulation of the heart |
Decreases HR |
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Because of the baroreceptor reflex, when normal arterial blood pressure decreases, the |
Frequency of afferent APs from baroreceptors decreases |
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A decrease in blood PH and an increase in blood carbon dioxide levels result in |
- increased HR - increased SV - increased sympathetic stimulation of the heart - increased CO |
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An increase in extracellular K+ levels can cause |
A decrease in HR |
