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structure from which chordae tendinae originate

papillary muscle

prevents blood movement from right ventricle to right atrium

pericardial cavity

membranes around the heart

pericardial sac

prevents blood movement from left ventricle to left atrium

mitral valve

gives rise to left and right pulmonary arteries

pulmonary trunk

drains blood from myocardium into right atrium

coronary sinus

inner lining of heart chamber


layer largely composed of cardiac muscle tissue


space containing serous fluid to reduce friction during heartbeats

pericardial cavity

drains blood from myocardial capillaries

cardiac vein

supplies blood to heart muscle

coronary artery

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

AV valves

the sound created when blood leaks back through an incompletely closed valve is called


the second sound of cardiac cycle occurs when what closes?

semilunar valves

the fibers of the cardiac condiction system are specialzed what?

cardiac muscle tissue

normally what node serves as the pacemake of the heart

SA Node

the what node is located in the inferior portion of ineratrial septum

AV node

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

purkinje fibers

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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