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Details Title: Anatomy Description: Heart2 Total Flash Cards: 9 Created: 02/12/2004 13:31:31	To study from this set of flash cards, or to create your own your own study flash cards, register HERE. If you are already a registered user, CLICK HERE.
Cards Term what is the cardiac cycle? Definition when the blood moves from areas of high pressure to low pressure(systole, diastole) Term what's systole? Definition contraction period(pressure rises) Term what's diastole? Definition relaxation period(pressure falls) Term what are the 3 cycles of cardia cycle? Definition 1. atrial systole-atria contract & ventricles complete filling 2. atrial diastole/ventricular systole: atria relax & ventricles start to contract pressure in ventricles closes AV valve first, then forces open semilunar valves 3. atrial diastole/ventricular diastole: atria & ventricles relaxed atria have been filling, when ventricular pressure drops, AV valves open & ventricles fill Term what sound does the heart make, and from what? Definition lubb, dupp -first(lubb)-beginning of ventricular systole when AV valves close -second(dupp)-beginning of ventricular diastole when semilunar valves close Term what's the cardiac output(CO)? Definition -amount of blood pumped by each ventricle in one minute -influenced by beats per minute & how much blood is ejected w/ each beat (ie stroke volume) Term What the CO equation? Definition CO=heart rate(HR) X stroke volume(SV) Term how can the CO be changed? Definition altered by changes in either variable heart rate regulated by autonomic nervous system stroke volume could inc. by: more blood returning to heart(blood shunted from GI to muscles) more blood is pumped out(contraction strength inc. due to sympathetic activation) Term the sympathetic nervous system on the CO does what? Definition it increases both the heart rate & stroke volume