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33 Cards in this Set
- Front
- Back
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The continuous one-way circuit of blood through the body in the bolld vessels
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Circulation
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Location of the heart
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Between the lungs and a bit to the left of the midline of the body
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The pointed, inferior portion of the heart
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Apex
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A thin, smooth layer of epithelial cells that lines the heart's interior
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Endocardium
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The heart muscle, the thickest layer, pumps blood through the vessels
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Myocardium
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A serous membrane that forms the thin, outermost layer of the heart wall
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Epicardium
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The sac that encloses the heart
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Pericardium
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The outermost, heaviest layer of the pericardium
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Fibrous pericardium
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Two layers of the pericardium serous membrane
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Parietal layer - outer
Visceral layer - inner |
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Upper chambers of the heart
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Atria
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Blood-receiving chambers of the heart
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Atria
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Lower chambers of the heart
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Ventricles
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A thin-walled chamber that receives the blood returning from the body tissues
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Right atrium
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Pumps the venous blood received from the right atrium to the lungs
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Right ventricle
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Receives blood high in oxygen content as it returns from the lungs in pulminary veins
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Left Atrium
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The chamber with the tickest wall; pumps oxygenated blood to all parts of the body
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Left Ventricle
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Partions which completely separate the heart's chambers; consist largely of myocardium
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Septum
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Separates the two atria
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Interatrial septum
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Separates the two ventricles
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Interventricular septum
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Valve with three cusps; located between the right atrium and right ventricle
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Right Atrioventricular valve (tricuspid valve)
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Valve with two cusps; located between the left atrium and left ventricle
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Left Atrioventricular valve (mitral valve)
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Valve with three half-moon cusps; located at the entrance to the pulmonary artery
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Pulmonary semilunar valve
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Valve with three half-moon cusps; located at the entrance to the aorta
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Aortic semilunar valve
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A dialated vein that opens into the right atrium near the inferior vena cava
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Coronary sinus
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Special features of the myocardium
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Lightly striated Intercalated disks Branching of fibers
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First branches of the aorta; fill when heart relaxes
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Coronary arteries
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Collect venous blood from the heart and empties into the right atrium
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Coronary sinus
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Phases of the cardiac cycle
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Diastolic - relaxation phase
Systolic - contraction phase |
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Volume pumped by each ventricle per minute
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Cardiac output
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Amount pumped with each beat
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Stroke volume
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Number of beats per minute
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Heart rate
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Node that initiates the heartbeats by generating an action potential at regular intervals; located in the upper wall of the right atrium
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Sinoatrial node (pacemaker)
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Node located between the atria and ventricles
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Atrioventricular node
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