Chapter 21-The Cardiovascular System: The Heart Flashcards Preview

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Flashcards in Chapter 21-The Cardiovascular System: The Heart Deck (36)
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31

av node

av node (atrioventricular)
-where 4 chambers meet
-signal transmitted to av node through internodal pathways

32

av bundle

transmits down interventricular septum

33

bundle branches

-branch off the av bundle
-moves further down the septum
-one supplies each ventricle

34

purkinje fibers

-reflect up external wall of ventricle
-extend into papillary muscles

35

ECG/EKG

-electrocardiogram
-P wave: depolarization of atria
-QRS: depolarization of ventricle
-T-wave: repolarization of ventricle
-cardiac output: 5L/min

36

autonomic control

-autorhythmicity: spontaneous contractions
-chemical control: NE and E: increase rate and force
-neural control in medulla
--cardioacceleratory centers: release NE/increase HR
--cardioinhibitory centers: release Ach/decrease HR