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Lecture 22
Heart II
23
Anatomy
Undergraduate 2
10/31/2010

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Term
SA node
Definition
-pacemaker
-collection of specialized "conducting cells" in right atrium
-initiates heartbeat
Term
AV node
Definition
-receives message from SA node and sends to bundle of His
-located in right atrium
Term
bundle of His
Definition
-collection of nerve fibers (tract) located in interventricular septum
-transmits message to Purkinje fibers
Term
Purkinje fibers
Definition
-located in walls of ventricles
-conduct impulse to myocardium
-results in ventricular contraction
Term
sympathetic stimulation
Definition
-releases norepinephrine
-acts on SA node
Term
parasympathetic stimulation
Definition
-releases acetylcholine
-inhibitory
Term
cardiac cycle
Definition
-SA node initiates
-atria contract, force blood into both ventricles
Term
systole
Definition
-ventricles contract
-AV valves close/semilunar valves open
-blood in right ventricle exits through pulmonary arties
-blood in left ventricle exits through aorta
-blood is under highest pressure
Term
diastole
Definition
-ventricles relax
-semilunar valves close/AV valves open
-blood fills atria waiting for signal from SA node
Term
cardiac cycle occurs
Definition
70 times per minute
Term
amount of blood pumped every minute
Definition
5 liters
Term
auscultation
Definition
act of listening to sounds of body
Term
lubb
Definition
-AV valve closing
Term
dupp
Definition
semilunar valve closing
Term
ausculatory areas
Definition
-aorta
-pulmonic
-tricuspid
-bicuspid
Term
aorta area
Definition
-aortic semilunar valve
-second intercostal space
-right side
Term
pulmonic area
Definition
-pulmonic semilunar valve
-second intercostal space
-left side
Term
tricuspid area
Definition
- right AV valve
-fifth intercostal space
-right side
Term
bicuspid valve
Definition
-left AV valve
-fifth intercostal space
-left side (apex of heart)
Term
coronary veins
Definition
blood is drained from heart tissue through here
Term
coronary sinus
Definition
coronary veins enter here
empties into right atrium
Term
right coronary artery
Definition
-marginal
-supplies myocardium of lateral side of right heart
-posterior interventricular
-travels in septum to supply posterior ventricles
-right atrium/ventricle
Term
left coronary arteries
Definition
-circumflex
-supplies left atrium
--anterior interventricular
-supplies interventricular septum and anterior walls of both ventricles
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