Sarcomere Flashcards
A sarcomere is composed of
overlapping filaments of actin and myosin as well as structural and binding proteins
A single sarcomere is defined as
the distance between two Z lines
__ _____ are bound structural proteins at the Z line
Thin (actin) filaments
The unbound end of the actin filaments projects
into the middle of the sarcomere
The unbound end of the actin filaments projects into the middle of the sarcomere where they interact with
thick (myosin) filaments during muscle contraction
Where in the sarcomere do actin and myosin interact
the middle
The A band corresponds to
myosin filaments in the sarcomere
In the A band there are
myosin filaments overlapped with actin filaments as well as non-overlapped myosin filaments.
The ______ _______ always remains the same length during muscle contraction
A band
The M line lies at
the center of the A band
The M line is where
Myosin filaments anchor to structural elements in the center of the sarcomere
Myosin and actin filaments overlap at the segment of the sarcomere
between the H and I bands
The I band is
the region of the sarcomere in which actin does not overlap with myosin
The H band is
the region of the sarcomere in which myosin does not overlap with actin.
During muscle contraction both H and I bands ________ in length
decrease
