Muscle Physiology Flashcards
The ______ nervous system controls skeletal muscles.
Somatic (part of the PNS)
Smooth muscles are controlled by the __________ nervous system.
Autonomic (part of the PNS)
Skeletal muscles contain _______ _______ cells that are bound by _______ _______.
Muscle fibers, connective tissues
A single muscle cells contains many ________ that extend the length of the cell.
Myofibrils
Striations are found in…
Cardiac and Skeletal muscles
Dark bands in a myofibril:
A bands
Light bands in a myofibril:
I bands
In the middle of the I bands there are bands called:
Z lines
A bands have light areas bisected by bands called:
M lines
The functional unit of a myofibril is a:
Sarcomere
A sarcomere extends from one ___ ______ to another.
Z line
Contraction of a myofibril is caused by a contraction of each:
Sacromere
Sarcomeres are comprised of: (2)
Actin and Myosin
Thin filament composition:
2 molecules of Actin
Thick filament composition:
Hundreds of Myosin molecules
Thin filaments are connected to:
one end of a Z line
Thick filaments are connected to:
M lines
Dark areas of A bands are where ____ and ____ _________ overlap.
thick, thin filaments
Light area of A bands are called _______, and consist of _____ filaments only.
H zones, thick
The width of the A band corresponds to the ________ of the _____ filaments.
Length, thick
