heart and blooooood test!! also diseases...
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28 terms
Terms | Definitions |
|---|---|
 pericardial sac | a tough fibrous connective tissue sac that completely surrounds the heart. |
| pericardal fluid | a lubricating fluid found between the heart and the pericardial sac that serves to cushion the heart |
| papillary muscle | muscles found inside the ventricls that help to prevent the aatrioventricular valves from opening backwards |
| chordae tendonae | thin threads of fibrous connective tissue that attach the papillary muscles to the valve cusps |
| foramen ovale | a hole located in the interatrial septum of th heart of a fetus. it allows blood to pass directly from the right atrium into the left atrium |
| ductus arteriosus | a vessel that attachs the pulmonary trunk to the aorta in the heart of a fetus. it allows blood to bypass the lungs of the embryo |
| coronary arteries | arteries found on the surface of the heart that deliver oxygenated blood to hte cardiac muscle |
| cardiac veins | veins found on the surface of the heart that remove deoxygenated blood to the cardiac muscle |
| cardiac sinus | a small pouch on the back of the heart into which the cardiac veins transport blood |
| cardiac cycle | all the events that occur tin the heart during one heartbeat |
| systole | the part of aheartbeat during which the ventricles contract |
| diastole | the part of a heartbeat during which thte ventricles relax |
| cardiac output | the volume of blood the heart pumps in 1 minute |
| stroke volume | the volume of blood the heart pumps during 1 heartbeat |
| heart rate | the number of heartbeats in one minute |
| conduction system | a network of special cardiac muscles cells in the wall of the heart that transports electric current at the correct time to each chamber of the heart |
| sinoatrial node | this node is located in the wall of the right atrium near the superior vena cava. it generates about 70 pulses of electric current each minute. it is called the heart's pacemaker |
| atrioventricular node | this node is located in the lower part of the interatrial sptum. it delays the electric pulse for about 1/2 second |
| bundle of his | this is located in the upper part of the interventricular septum. it transports the elctric pulse out of the AV node |
| bundle branches | these are located on each side of the interventricular septum. they transport the electric pulse from the bundle of his to the bottom of the heart |
| purkinge fibers | these are located in the walls of the ventricles. they transport the electric pulse upward throught hte walls of the ventricles |
| electrocadiogram | a graph created by the electric pulse as it moves throught the conduction system |
| p wave | this part of an EKG is created as the electric pulse leaves the SA node and passes throught the walls of the atria |
| pr segment | this part of an EKG is created as the electric pulse moves through the AV node, bundle of his, and bundle branches |
| qrs complex | this part of an EKG is created as the electric pulse moves throught the purkinge fibers in the walls of the ventricles |
| t wave | this part of an EKG is created as the cardiac muscle cells relaz and repolarize |
| vagus nerve | a nerve transporting electric pulses to the SA node that slows the heart rate |
| cardioaccelerator nerve | a nerve transporting electric pulses to the SA node that speed up the heart rate |
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