muscle tissue W4 (cardiac) Flashcards
cardiac muscle is triated? or unstriated?
striated
how many nuclei does an individual cardiac muscle cell have
one, sometimes two
cardiac muscle cells branch, why?
so they can contact several other cells
what types of cell junctions are present between cardiac muscle cells
adhering and communicating
where are adhering and communicating cell junctions found
in specialised structures called intercalated disks
cardiac muscle cells are innervated by the ….
autonomic nervous system
cardiac muscle cells - 50% of cytoplasm is taken up by …
mitochondria
the presence of lots of mitochondria in cardiac muscle cells implies what about cardiac tissue
it is a highly energetic tissue
cordiac tissue contains lot? or not many? capilaries
lots of capillaries
when a tissue contains lots of capilaries it is refered to as…
highly vascular
each cardiac cell is lined by a layer of ….. CT called …..
loose
endomysium
what causes the striated appearance of cardiac muscle cells
arrangement of thick and thin filaments in the myofibrils within cardiac muscle cells
in comparison to skeletal muscle cells, cardiac muscle cells have less? more? sacroplasmic reticulum?
much less
do cardiac muscle cells have t tubules
yes
cardiac muscles have diads, what are they composed of ?
one t tubule and one cistern of sacroplasmic reticulum
in caparison to skeletal muscle tissue, cardiac muscle tissue relies more/less? heavily extracellular calcium?
more
what is the a vague cause of coronary artery disease
a narrowing of arteries which supply oxygen to cardiac muscle cells
whats anothery name for cardiac muscle cells
cardiomyocytes
what are intercalated disks
junctions between cells which anchor cadiomyocytes
what are is the role of desmosomes in intercalated disks between cardiac muscles
prevent cells from separating during contraction
what is the role of gap junctions in intercalated disks between cardiomyocytes
they allow ions to pass from cell to cell
gap junctions are only found in …..muscle
cardiac
