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EKG--
wks 1&2
| Question | Answer |
|---|---|
| `the upper chambers of the heart | atria |
| the lower cahmber of the heart | ventricle |
| base | top of the heart |
| apex | bottom of the heart |
| pericardium | closed 2 layered sac that surrounds the heart |
| the smooth outer surface of teh heart | epicardium |
| the thick middle layer of the heart | myocardium |
| the innermost layer of the heart | endocardium |
| tricuspid valve | located between the right atrium and the right ventricle |
| chordae tendineae | fine chords of dense tissue that attatch to papillary muscles in the wall of the ventricles |
| arteries | thick walled and muscular blood vessels that function under high pressure to convey blood from the heart out to the rest of the body |
| coronary arteries | carry oxygenated blood throughout the myocardium |
| veins | blood vessels that carry blood back to the heart |
| superior vena cava | drains blood from the head and neck |
| inferior vena cava | collects blood from the rest of the body |
| capillaries | tiny blood vessels that allow for the exchange of oxygen,nutrients,and waste products between the blood and the body |
| right atrium | chamber that receives unoxygenated blood from the head, neck, and trunk |
| left atrium | receives oxygenated blood form the pulmonary system |
| left ventricle | receives oxygenated blood from the left atriuma nd pumps it to the body. |
| cardiac cycle | represents the time form initiation of ventricular contraction initiation of the next ventricular contraction |
| systole | ventricular contraction |
| diastole | ventricular relaxation |
| stroke volume | volume of blood pumped out of one ventricle of the heart in a single beat. |
| cardiac output | amount of blood pumped by the ventricle in one minute |
| automaticity | the ability of cardiac cells to generate their own electrical impulses spontaneously without external stimulation |
| excitability | the ability of cardiac cells to repond to an electrical stimulus. |
| conductivity | is the ability of cardiac cells to shorten and cause cardiac contraction in response to an electrical stimulus |
| sa node | commonly referred to as the primary pacemaker of the heart because it normally depolarizes more rapidly than any other part of the conduction system. |
| internodal tracts | distribute the electrical impulse throughout the atria and transmit the impulse from the sa node to the av node |
| av node | located on the floor of the right atrium, the electrical activity is delayed appx 0.05 sec |
| av junction | the region where the av node joins the bundle of his |
| bundle of his | the conduction pathway that leads out of the av node |
| bundle branches | two main branches that conduct electrical activity from the bundle of his down to the pukinje network |
| purkinje's network | a network of fibers that carries electrical impulses directly to ventricular muscle cells |
Created by:
anewkirk
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