cardiac muscle

why is cardiac muscle striated

because of overlapping actin and myosin

does cardiac muscle have sarcomeres

yes

how does contraction occur in cardiac muscle

sliding filament mechanism

describe skeletal muscle fibers

short, branches, and connected via gap junctions

intercalated disks

gap junctions that connect cardiac muscle fibers

AP travel in cardiac muscle

will travel from cardiac cell to another through intercalated disks

myocardium 

a mass of cardiac muscle cells connected to each other via gap junctions 

cardiac muscles producing AP

some can produce AP automatically without nervous system input

where do AP begins in cardiac muscle

regions called the pacemaker

nervous system input on cardiac muscle cells

can influence it but not required 

specializes cardiac muscle cells can do what

can generate their own AP’s

ANS & Hormones on the skeletal muscle 

influences heart rate 

where is troponin found in cardiac muscle

in the thin filaments