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Cards In This Set
| Front | Back |
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The heart is located...
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In the mediastinum of the thoracic cavity.
(between the sternum, lungs and thoracic vertebrae) |
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The serous membrane of the heart is...
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The pericardium.
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Outer Parietal
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Attaches heart to mediastinum.
has fibrous tissue so heart doesn't over expand. |
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Visceral Layer
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Called epicardium. lines the surface of the heart.
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Pericardial Cavity
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Space between parietal and visceral layer. filled with fluid to reduce friction. Both layers have mesothelium that secrete serous fluid.
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Myocardium
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Muscle of the heart.
uninucleated cardiac muscle cells. |
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Endocardium
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Line the heart chambers. inner layer of the heart. endothelial cells.
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Auto-rhythmic
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Regulates its own relaxation and contraction phases without nerve stimulation.
can be affected by nerve stimulation. |
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Sinu-Atrial Node (SA Node)
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Action potential originates here.
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Atrivoventricular node (AV node)
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Pass slowly through atrium wall so atria can contract.
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Atrioventricular bundle
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Signal passes through here to divide into left and right bundles to the ventricles.
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Purkinje fibers
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Begin at apex of ventricles. stimulate ventricle walls simultaneously to elicit stronger contraction.
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Baroreceptors
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Located in the carotid sinus and aortic arch respond to increase in blood pressure. this stretches the carotid arteries and aorta. increase action potential generation.
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Medulla Oblongatta
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Receives information from the vagus and glossopharyngeal nerves from the heart to increase parasympathetic stimulation.
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Superior and Inferior Vena Cava
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Deliver blood to right atrium.
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