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chap2 EKG
| Question | Answer |
|---|---|
| bundle of His(AV bundle) | conducts electrical impulese from the artia to the ventricles |
| sinoatrial (SA) node (pacemaker) | initiates heart at a rate of 60-100 beats per minute with electrical impulse that causes depolarization |
| atrioventricular (AV) node | delays the electrical impulse to allow for the atria to complet their contraction and ventricles to fill before the next contraction |
| bundle branches | conducts impulses down both sides of the interventricular septum |
| purkinje fibers (network) | distributes the electrical impulses through the right and left ventricles |
| cardiac cycle | the contraction and relaxation of the heart together make up the? |
| diastole | relaxation of heart, when blood fills the heart |
| systole | contraction of heart, when blood leaves the heart |
| semilunar valves | separate ventricles from arteries leading to lungs or body |
| aortic | semilunar valve, between left ventricle and aorta |
| pulmonary | semilunar valve, between rt. ventricle and pulmonary artery |
| tricuspid valve | valve located between the right atrium and right ventricle |
| mitral valve | atrioventricular valve between the left atrium and left ventricle |
| function of the heart | pump blood to and from all tissues of body, supplies nutrients and oxygen, remove carbon dioxide and waste products |
| top chambers of the heart | right and left atrium |
| bottom chambers of the heart | right and left ventricle |
| endocardium | inner layer, lines chambers and valves. were the purkinje fibers are located |
| myocardium | middle, thickest, responsible for contraction |
| epicardium | outside, thin kayer, contains coronary arteries, inner layer of pericardium |
| pericardium | double- layer sac encloses heart |
| interventricular septum | between right and left ventricle |
| automaticity | heat has its own innate ability to initiate an electrical impulse. works on its own. |
| conductivity | is the ability of the heart cells to recieve and transmit an electrical impulse. allows the electrical pulse. |
| contractility | ability of heat cells to shorten inresponse to an electrical stimulus. knows how much to use. |
| excitability | ability of the heart to respond to an impulse or stimulus. willing to accept stimulus. |
| left side | of heart pumps oxygenated blood to the body tissue. |
| right side | of the heart pumps deoxygenated blood to the lungs. |
| pulmonary circulation | transportation of blood to and from lungs |
| systemic circulation | transportation of blood between the heart and the rest of the body,excluding the lungs |
| coronary circulation | circulation supplies blood to and from the heart through the coronary arteries and cornary sinus. |
| 60-100 | average heart beats approximately |
| polarization | state of cellular rest in the heart |
| depolarization | cellular stimulation that causes the hear to contract |
| repolarization | cellular recovery that follows each contraction |
| isoelectic line | straight line, represents the period when no electrical activity is occuring in the heart. |
| cardiac cycle | contraction and relaxation period of the heart together make the? |
| ECG waveform includes | P wave, QRS complex,T wave |
Created by:
jasra
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