structure from which chordae tendinae originate
prevents blood movement from right ventricle to right atrium
membranes around the heart
prevents blood movement from left ventricle to left atrium
gives rise to left and right pulmonary arteries
drains blood from myocardium into right atrium
inner lining of heart chamber
layer largely composed of cardiac muscle tissue
space containing serous fluid to reduce friction during heartbeats
drains blood from myocardial capillaries
supplies blood to heart muscle
distributes blood to body organs except lungs
compare structure of right atrioventricular valve with that of pulmonary valve`
the right atrioventricular valve is made of 3 large cusps that contain tendinae. the pulmonary valve is made of 3 smaller pocket like cusps that lack chordae tendinae
Describe the action of right atrioventricular valve when you squeezed the water filled right ventricle
The cusps of the right atrioventricular valve move upward into horizontal position and close the opening between right atrium and right ventricle
about what percent of blood from atria passes into the ventricles before the atrial walls contract
the period which a heart chamber is contracting is called
the period during which heart chamber is relaxing is caled
during ventricular contraction AV valves are
during ventricular relaxation, the AV valves are
the pulmonary and aortic valves open when the pressure in what exceeds the pressure in the pulmonary trunk and aorta
heart sounds are due to what? in heart tissues created by changes in blood flow
the first sound of a cardiac cycle occurs when what are closing
the sound created when blood leaks back through an incompletely closed valve is called
the second sound of cardiac cycle occurs when what closes?
the fibers of the cardiac condiction system are specialzed what?
cardiac muscle tissue
normally what node serves as the pacemake of the heart
the what node is located in the inferior portion of ineratrial septum
the large fibers on the distal side of the AV node make up what?
AV bundle of his
the fibers that carry cardiac impulses from the interventricular septum into the myocardium are called
what is a recording of an electrical change occuring in myocardium during the cardiac cycle
between cardiac cycles, cardiac myscle fibers remian what? with no detectable electrical charges
the P wave corresponds to depolarization of the muscle fibers of what
the QRS complex corresponds to depolarization of the muscle fibers of what?
the T wave corresponds to repolarization of the muscle fibers of the
why is atrial repolarization not observed in the ECG
Atrial repolarization occurs at the same time as ventricular repolarization.
a rapid heartbeat is called
a slow heartbeat is called
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