circulatory system Flashcards
1
Q
what is epicardium composed of?
A
- mesotheium ( simple squamus)
- loose areolar CT
2
Q
what is endocardium made of?
A
- endothelial cells inner walls
- subendothelial cells w/ lots of elastic fibers (red)
3
Q
where is the impulse-conductive system found?
A
in deepest layer of endocardium
4
Q
what are the cardiac muscle cells embedded in?
A
in endomysium
5
Q
are sattelite cells present in cardiac muscles?
A
NO, so no regeneration of injured myocytes
6
Q
what are the three types of cells of the impulse-conducting system?
A
- p-cell ( 5-8 um) pacemaker
- transitional cells
- purkinje cell (subendocardial ventricular conducting cell)
they are lighter stained than working cardiac myocytes
7
Q
what does the conductig cell contain making them more pale?
A
glycogen accumulations
8
Q
what are the valves made of?
A
- dublications of endocardium
1. outermost: fibrosa
2. inner: spongiosa
9
Q
what does mesothelium produce?
A
serous liquid
10
Q
difference b/w spongiosa and fibrosa?
A
spongoisa: CT is loose collagenous w/ elastic fibers
fibrosa: CT densely collagenous
