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atria, ventricles

the four chambers of the hear consist of the r/l (?) and the r/l (?)


Blood from the veins enter the (?)


the (?) forces blood out into the areries

tricuspid, pulmonary semilunar, bicuspid, aortic semilunar

the four vales of the heart are (?), (?), (?), and (?)


this valve prevents backflow from right ventricle and right atria during ventricular contraction - located in right atroventricular orifice

pulmonary semilunar

this valve prevents backflow from the pulmonary trunk to right ventricle - located in entrance to pulmonary trunk


this valve prevents backflow from left ventricle to left atria - located in left atrioventricular orifice

aortic semilunar

this valve prevents backflow from aorta to left ventricle - located in entrance to aorta

intraventricular septum

the (?) seperates ventricles

intraatrial septum

the (?) separates atria

chordae tendinae

these are fibrous tendons attached to cusps of bicuspid and tricuspid valves on ventricular side

blah blah blah.see video

Explain the path of blood flow in the heart. Remember, oxygenated vs unoxygenated


Blood supply to the heart comes from first 2 branches of the (?)


Heart must beat (?) to supply blood to cells

cardiac, coronary sinus

Blood in heart is drained by (?) veins into (?)






in the heart, there are (?) functional syncytia (muscle masses)

atrial syncytium -atrial walls

One muscle mass of heart is (?)

ventricular syncytium-ventricle walls

One muscle mass of heart is (?)


each heartbeat is triggered by a (?) in the nervous system

heart, cardiac muscle

our heartbeat is myogenic, meaning that the signal originates inside the (?) in pacemaker cells derived from the (?)

sinoatrial (sa), right, epicardium, superior

the (?) node is a patch of modified myocytes in the (?) atrium, just under the (?) near the (?) vena cava. this is the pacemaker that stimulates contraction in atrial muscles.

sinoatrial node

the (?) can excite itself without being stimulated from the outside

70, 80

rhythmic impulse is (?) to (?) times a minute

atrioventricular, conduction, walls or syncytia

the (?) node is located in the floor of the right atrium near the interatrial septum. It is the (?) pathway between atrial and ventricular (?)

reach, diffuse

the impulse from the SA does not quite (?) the AV node. the impulse must (?) through tissue from end of SA fiber to AV node.

atria, AV

impulses from the SA node spread throughout (?), then are passed to (?) node.

atrioventricular bundle (His), interventricular, left,right, purkinje

the impulses leave the AV node and travel along the (?). this bundle enters the (?) septum, divides into (?) and (?) branches before finally giving rise to (?) fibers.

papillary, apex, myocardium, impulse, contraction

the purkinje fibers spread into (?) muscles and into (?) of heart. then, they branch throughout ventricular (?). the (?) from the purkinje fibers cause the (?)

vagus, accelerator

the right (?) and (?) nerves innervate the SA node

vagus, accelerator

the left (?) and (?) nerves innervate the AV node

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