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32 terms

The Heart

STUDY
PLAY
atria, ventricles
the four chambers of the hear consist of the r/l (?) and the r/l (?)
atria
Blood from the veins enter the (?)
ventricles
the (?) forces blood out into the areries
tricuspid, pulmonary semilunar, bicuspid, aortic semilunar
the four vales of the heart are (?), (?), (?), and (?)
tricuspid
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
bicuspid
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
aorta
Blood supply to the heart comes from first 2 branches of the (?)
continuously
Heart must beat (?) to supply blood to cells
cardiac, coronary sinus
Blood in heart is drained by (?) veins into (?)
systole
contraction=(?)
diastole
relaxation=(?)
2
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 (?)
pacemaker
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