Chapter 10 (Part 3) Flashcards
Where is cardiac muscle found?
myocardium
What are the function of cardiac muscle?
propel blood out of heart, maintain blood pressure
What is the shape of cardiac muscle?
short branched, striated
How many nuclei do cardiac muscle have?
1-2
Specialized junctions in cardiac muscle
intercalated disc
What nervous system controls cardiac muscle?
autonomic
Where are smooth muscles found?
Walls of hollow organs, along passageways, internal sphincters, arrector pili, iris
What are the functions of smooth muscle along hollow organs?
mix material, strengthen organ, propel material
what are the functions of smooth muscle along passageways?
control diameter, propel material, breakdown material, regulate passageway
what is the shape of smooth muscle?
wide middle with tapered ends
how many nuclei do smooth muscle have?
1
Location where intermediate filaments interact with the sarcoplasm
dense bodies
location where intermediate filaments attach to sarcolemma
Dense plaques
What nervous system are smooth muscle controlled by?
autonomic
fibers receive stimulation to contract individually
multiunit smooth muscle
where are multiunit smooth muscle found?
iris, arrector pili, larger arteries, large passageways for respiratory system
Fibers stimulated to contract in unison
Single unit smooth muscle
Where are single unit smooth muscle found?
Wales of digestive, urinary, reproductive tracts, most blood vessels
Invagination of sarcoma with SR contacting it
caveolae
Allow contraction to be signaled using different modalities
Sparse SR
Myosin heads have modifications that allow them to latch onto actin and remain attached without using additional ATP
Latchbridge mechanism
