Anatomy Heart
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Created by:
emilyanne2008 on March 27, 2008
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26 terms
Terms | Definitions |
|---|---|
 Pericardium | membrane that surrounds and protects the heart; confines heart to position in mediastinum - allows some freedom for vigorous contraction |
| Epicardium | adheres tightly to surface of heart |
| Myocardium | middle heart muscle - makes up bulk for heart - pumping action |
| Endocardium | innermost heart muscle - provides smooth lining for chambers of heart & covers heart valves |
| Septum | thin partition between left & right atrium/ventricle |
| Ligamentum arterriosum | connects arch of aorta and pulmonary trunk |
| systemic circulation | left side of heart = pump - receives oxygen-rich from lungs |
| pulmonary circulation | right side of heart = pump - receives deoxygenated returning from systemic circulation |
| AV node | only site where action potentials can conduct from atria to ventricles |
| SA node | where cardiac excitation normally begins |
| Purkenje | rapidly conduct action potential from apex of heart upward to remainder of ventricular myocardium |
| Systole | phase of contraction |
| Diastole | phase of relaxation |
| Cardiac Cycle | includes all events associated with one heartbeat |
| Produces waves on an ECG/EKG | 1. P wave 2. atrial systole 3. QRS wave 4. ventricular systole 5. T wave 6. ventricular diastole |
| Artery | carry away from heart - has 3 coats/tunics |
| Arteriole | small artery - delivers to capillaries |
| Capillary | microscopic vessels - connect arterioles to venules |
| Tunica interna | innermost coat of arteries - closest to lumen - simple squamous |
| Tunica media | middle of arteries - thickest layer |
| Tunica externa | outer coat of arteries |
| Venule | small veins - collect from capillaries & drain into veins |
| Vein | vessel - moves back to heart |
| Ductus arteriosus | vessel that connects pulmonary trunk with aorta |
| pressure with age | gets higher because vessels aren't in as good of shape |
| Transfer of through circulatory system | pressure when beating & pressure when not beating - maintained in system because of valves |
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