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Side ASide B
The heart is located...
in the mediastinum of the thoracic cavity.(between the sternum, lungs and thoracic vertebrae)
The serous membrane of the heart is...
attaches heart to mediastinum. has fibrous tissue so heart doesn't over expand.
called epicardium. lines the surface of the heart.
space between parietal and visceral layer. filled with fluid to reduce friction. Both layers have mesothelium that secrete serous fluid.
muscle of the heart.uninucleated cardiac muscle cells.
line the heart chambers. inner layer of the heart. endothelial cells.
regulates its own relaxation and contraction phases without nerve stimulation. can be affected by nerve stimulation.
Sinu-Atrial Node (SA Node)
action potential originates here.
atrivoventricular node (AV node)
pass slowly through atrium wall so atria can contract.
signal passes through here to divide into left and right bundles to the ventricles.
begin at apex of ventricles. stimulate ventricle walls simultaneously to elicit stronger contraction.
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.
receives information from the vagus and glossopharyngeal nerves from the heart to increase parasympathetic stimulation.
Superior and Inferior Vena Cava
deliver blood to right atrium.
tricuspid (AV) valve
connects right atrium and ventricle
pulmonary semilunar valve
empties blood into the pulmonary arteries.
bicuspid AV Valve
empties blood from left atrium into the left ventricle
systemic semilunar valve
empties blood from left ventricle to the aorta.
all coronary veins merge herelocated in coronary sulcusempties deoxygenated blood to right atrium
great c.v., small c.v., middle c.v., posterior c.v.
hold valves shut