6. Cardiac Histology Flashcards
What are the two parts of the transverse region of the intercalated disc?
Fascia adherens: actin filaments
Desmosomes: intermediate filaments
In what layer are the coronary vessels found?
In the epicardial fat
What are lipofuscin granules?
Small bodies of materials digested by lysosomal function. They accumulate near the nuclei as a part of aging.
What helps smooth muscle cells contract uniformly?
Gap junctions
Where are the T Tubules in the myocardium located?
On top of the Z discs
What is released by myoendocrine cells?
What is its function?
Atrial natriuretic factor.
Tells the kidney to increase the glomeriolar filtration rate.
What anchors the contractile apparatuses of smooth muscle to the cell wall?
Dense bodies
What two structures sit on top of Z discs?
T Tubules
Intercalated disks
What do we find in the longitudinal region of the intercalated disc?
Gap junctions
What is the epicardium made of?
Fibrocollagenous connective tissue with a mesothelium lining.
What are dense bodies made of?
Desmin and vimentin
What type of cardiac myocyte lacks T tubules and has less than normal intercalated discs?
Cardiac myocytes of the purkinje fibers
What is the special name for the T Tubules of smooth muscle?
Caveolae
What is the endocardium made of?
Endothelium and a thin layer of loose CT
