= is the system of specialized muscle fibers that conduct cardiac impulse from the sinatrial node into the myocardium cardiac conduction system É/–ü¼’â@The cardiac conduction system sends impulses from the _____ to the ________ SA node to the myocardium É/–ü¼’â@The S-A node initiates cardiac cycles and regulates regular rhythmic contractions ( _____) sinus rhythm É/–ü¼’â@What is the specialized muscle tissue localized in the floor of the right atrium called? A-V node É/–ü¼’â@Describe the route of cardiac conduction system. S-A node -- A V node -- AV bundle (bundle of His) -- bundle branches -- purkinje fibers É/–ü¼’â@What does A V stand for?? What is another name for A V bundles?? A V = atrioventricular, A V bundles = Bundles of His É/–ü¼’â@The heart is controlled by the cardiac centers in the ? medulla oblongata and innervated by the ANS É/–ü¼’â@the vagus nerve sends impulses to the _____ and the _____. These all stem from which system (symp or para) SA node and the AV node. they stem from the parasympathetic nervous system É/–ü¼’â@The cardioacceleratory center is located in which system (parasympathetic, autonomic, sympathetic) and what does it do?? The cardioacceleratory center increases heart rate - located in the sympathetic nervous system É/–ü¼’â@the Cardioinhibtory center does what and which system is it in? slows down the heart rate -= in the parasympathetic É/–ü¼’â@Where does the cardioacceleratory center synapses at ? thoracic spinal cord É/–ü¼’â@Where does the cardioinhibitory ctr synapses at? dorsal motor nucleus of the medulla É/–ü¼’â@which wave results from depolarization wave from the S A node? The P wave É/–ü¼’â@which wave has atrial contraction ? p wave É/–ü¼’â@which wave has ventricular depolarization? QRS wave É/–ü¼’â@which wave has ventricular repolarization T wave É/–ü¼’â@ECG stands for what? - it is a recording of the electrical changes in the _______- during a cardiac cycle electrocardiogram - changes in the myocardium É/–ü¼’â@What are the 3 waves P, QRS,T called? deflection waves É/–ü¼’â@What are the 3 phases of the cardiac cycle? 1) Ventricular filling 2) ventricular systole 3) Relaxation Period É/–ü¼’â@In which stage of the cardiac cycle do you have rapid ventricular filling occur? approx how much is filled Ventricular filling phase - 70% filled É/–ü¼’â@When ventricles contain the maximum volume of blood , it is called the ? end-diastolic volume EDV É/–ü¼’â@In which phase does the Semilunar valves open? Ventricular Systole É/–ü¼’â@What is it called when all 4 valves are closed? Which phase does it occur in? Isovolumetric contraction - during Ventricular Systole É/–ü¼’â@In which phase does the end diastolic volume occur? ventricular filling É/–ü¼’â@Ventricular ejection occurs but some blood is still remaining in the ventricle what is this called and which phase does it occurr in? end systolic volume ESV - occurs in ventricular systole É/–ü¼’â@The relaxation period occurs when? from T wave to P wave É/–ü¼’â@isovolumetric relaxation is what? in which phase does it occur? interval when ventricular blood volume does not change, occurs in relaxation period É/–ü¼’â@cardiac output = ? HR (heart rate) X SV (stroke volume) É/–ü¼’â@stroke volume is equal to the difference between ? EDV and ESV É/–ü¼’â@ É/–ü¼’â@