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Chapter 6

KIN 324K Chapter Notes - Chapter 6: Cardiac Muscle, Pulmonary Circulation, Endocardium

Course Code
KIN 324K
Farrar Roger

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Anatomy Unit 6
epicardium - outermost heart layer
serous membrane composed of simple squamous epithelium and an underlying
layer of areolar connective tissue
as we age, this becomes thicker
myocardium - middle layer of the heart wall
cardiac muscle tissue and is the thickest of the three heart wall layers
contraction of this allows blood to be pumped
endocardium - internal surface of the hear and external surfaces of the heart valves
simple squamous epithelium and underlying layer of areolar connective tissue
continuous with the inner lining of blood vessels
AV valve - right: 3 cusps
left: 2 cusps
when open, the cusps extend into the ventricles, allowing blood to move from the
atrium to the ventricles
AV valves, close, papillary muscles, chordae tedineae - the ventricles contact and
blood is forced superiorly as the ventricular pressure rises, this causes _ _ to _. The _
_secure the thin _ _ that attach to the lower surface of each AV valve cusp which
prevents the valve from inverting and being pushed open, and preventing blood
flow back into the atrium.
semilunar valves - each has 3 half moon shaped cusps and no chordae tendinae or
papillary muscles
open when the ventricles contract and the force of blood pushes the AV valves open
semilunar valves close - occurs when the ventricles relax and the pressure in the
ventricle becomes less than the pressure in a great arterial trunk
prevents blood flow back into the ventricle
intercalated discs - link cardiac muscle cells together both mechanically and
-gap junctions
desmosomes - protein filaments that anchor into a protein plaque on the internal
surface of the sarcolemma
prevent cardiac muscle cells from pulling apart
gap junctions - protein pores between sarcolemma and adjacent cardiac muscle cells
provide a low distance pathway for the flow of ions between the cardiac cells
allows for action potential
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