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Anatomy Dr Johnson Ch 17 Heart
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15
Anatomy
Undergraduate 4
03/29/2009

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Term
mediastinum
Definition
middle cavity of thorax where heart resides
Term
pericardium
Definition
'sac' surrounding the heart
Term
parietal layer of pericardium
Definition
outer layer of the pericardial sac
Term
auricle
Definition
name of external ear OR the wrinkled sac on the atria
Term
intercalated disks
Definition
connections of heart muscle cells.
Term
functional syncytium
Definition
due to gap junctions, the heart behaves as one ___ ____.
Term
automaticity / autorhythmycity
Definition
cells of heart can activate themselves, a property termed...
Term
absolute refractory period
Definition
section of the heartbeat that lasts longer than in the muscle contraction
Term
slow Ca2+ channels
Definition
channels responsible for the plateau seen on the graph of depolarization of the heart
Term
plateau
Definition
extended depolarization is called ___. occurs in the heart
Term
ischemia
Definition
lack of blood/oxygen to a tissue. can lead to tissue death
Term
sinoatrial node
Definition
pacemaker of the heart
Term
isovolumetric stage
Definition
stage of heartbeat where the volume of blood in ventricle doesn't change. this is due to rising pressure to meat that in aorta or pulmonary circuit.
Term
preload and afterload are maximal when heart is stretched past normal due to venous return
Definition
Frank- Starling Law of the Heart
Term
Tachycardia and bradycardia
Definition
high and low heart rate, respectively
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