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28 Cards in this Set
- Front
- Back
Vascular Supply for Heart:
the aorta gives rise to the ___ ___ ___ that branches into the ___ ____ ____ and ____ _____ |
left coronary artery
anterior interventricular artery circumflex artery |
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supplies the anterior and left regions of the heart (artery)
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left coronary artery
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Vascular Supply for Heart:
aorta also gives rise to ___ ___ ___ that branches into ____ _____ ____ and ____ _____ |
right coronary artery
posterior interventricular artery marginal artery |
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supplies the posterior and right regions of the heart
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right coronary artery
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Vascular Supply for Heart:
blood returns to the ___ ___ via the ____ ____ which receives blood from the ___ ___ ____ and ____ ____ ____ |
right atrium
coronary sinus great cardiac vein middle cardiac vein |
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Internal Heart Anatomy:
what lies between the atria and ventricles? -right valve? -left valve? |
atrioventricular (AV) valves
tricuspid bicuspid |
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AV valves ___ to allow bloowd to flow from atria to ventricles and _____ when ventricles contract
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open
close |
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AV valves free edges attach to (connective tissue) and (finger-like projections of cardiac muscle in the ventricles)
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chordae tendineae
papillary muscles |
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Papillary muscles ____ when ventricles ____ and ____ valves from ______
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contract, contract
prevent, prolapsing |
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papillary muscles are extensions of ____ ____ (bumpy ridges of cardiac muscle in the _____)
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trabeculae carneae
ventricles |
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the internal walls of the ____ also contain bumpy ridges of muscle called ___ ___
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atria
pectinate muscles |
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"half-moon" valves each has three cusps
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semilunar valves
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between right ventricle and pulmonary trunk
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pulmonic valve
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between left ventricle and aorta
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aortic valve
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Semilunar valves ____ when the ventricles contract and ____ when the ventricles relax
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open
close |
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semilunar valves close to prevent backflow of blood from the ___ ___ or ____ into the _____
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pulmonary trunk or aorta into the ventricles
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Fibrous Skeleton:
-_____ ____ for the valves and cardiac muscle cells -____ ____ the ventricular muscle cells from the atrial muscle cells |
attachment sites
electrically insulate |
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a system of specialized cardiac muscle cells
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conducting system
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conducting system generates ___ ____ at regular intervals
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action potentials
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cells that contract to PUMP the blood OUT of the heart
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contractile cells
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Components of Conducting System:
-____ ___ -____ ___ -conducting cells |
SA node (sinoatrial)
AV node (atrioventricular) |
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conducting cells carry action potential through chanbers in the ventricles:
-___ ____ __ ____ -____ _____ |
AV bundle of His
Purkinje fibers |
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Impulse Conduction in Heart:
cells in SA nodes are called the ____ ___ -depolarize ____ -depolarize ____ than cells in AV node -_____ action potential -located at the ___ of the heart |
pacemaker cells
spontaneously faster initiate base |
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Impulse Conduction of Heart (2 and 3):
stimulus spreads to the __ ___. meanwhile, the ___ contract and blood flows from the atria to the _____ |
AV node
atria ventricles |
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Impulse Conduction (4):
stimulus then travels from the __ ___ through the fibrous skeleton via the __ ___ __ ___ to the ___ of the heart |
AV node
AV bundle of His apex |
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Impulse Conduction (5/6):
at the heart's apex the stimulus is carried to the ___ ____. the ____ now contract beginnning at the ____ blood flows from left ventricle to aorta to be distributed to the ____ and from the right ventricle to pulmonary trunk and on to the ____ |
purkinje fibers
ventricles apex body lungs |
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Autonomic Regulation(1):
autonomic innervation influences the ___ of contraction by innervating the __ ___ - _____ stimulation: ____ heart rate -_____ stimulation: ____ heart rate |
rate
SA node parasympathetic:reduces sympathetic:increases |
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Autonomic Regulation(2):
autonomic innervation influences the ____ of contraction by directly innervating ___ ___ ___ -____ stimulation: affects ___ contraction only and ____ force of contraction -____ stimulation: affects ___ and ____ contration and ____ force of contraction |
force
cardiac muscle cells parasympathetic:atrial, decreases sympathetic:atrial and ventricular, increases |