Anatomy Lab Practical- The Heart Flashcards

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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... the pericardium.

Outer Parietal attaches heart to mediastinum.
has fibrous tissue so heart doesn't over expand.
Visceral Layer called epicardium. lines the surface of the heart.
Pericardial Cavity space between parietal and visceral layer. filled with fluid to reduce friction. Both layers have mesothelium that secrete serous fluid.
Myocardium muscle of the heart.
uninucleated cardiac muscle cells.
Endocardium line the heart chambers. inner layer of the heart. endothelial cells.
auto-rhythmic 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.
atrioventricular bundle signal passes through here to divide into left and right bundles to the ventricles.
purkinje fibers begin at apex of ventricles. stimulate ventricle walls simultaneously to elicit stronger contraction.
Baroreceptors 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.
Medulla Oblongatta 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.
coronary sinus all coronary veins merge here
located in coronary sulcus
empties deoxygenated blood to right atrium
coronary veins great c.v., small c.v., middle c.v., posterior c.v.
chordae tendineae hold valves shut