Muscles Flashcards
What is this?
Electron Micrograph of a Muscle Fiber
What are the two dark lines on each side?
Z lines/discs/bands
What filament is found within the dark shaded area in the center?
Myosin filament
What filament is found in the light-shaded areas on either side?
Actin Filament
What band is represented by the two light-shaded areas on either side?
I-Band (L”I”GHT) I in light
What band is represented by the dark-shaded area in the center?
A-Band “dArk”
What is the term for the area between two z-discs?
Sarcomere
In muscle fibers, which is the thick filament, myosin or actin?
Myosin
What is the line in the center of the sarcomere called?
M-Line
What is the zone that the M-line is located in?
H-Zone
What protein covers the myosin binding sites on muscle fibers?
Tropomyosin
Troponin has 3 components, what are they?
Troponin - T
Troponin - I
Troponin - C
During resting state, __________ covers the myosin binding sites in actin.
Tropomyosin
Troponin - T binds with what?
Tropomyosin
Troponin - I binds with what?
Actin
Troponin - C binds with what?
Calcium
What part of myosin has ATPase binding activity?
Head
What type of muscle is this?
Smooth, nuclei are in the center, no striations or branching.
What type of muscle is this?
Smooth, nuclei are in the center, no striations or branching.
What type of muscle is this?
Smooth, nuclei are in the center, no striations or branching.
What type of muscle is this?
Skeletal, nuclei are on the edges and not in the center, unbranched
What type of muscle is this?
Skeletal, nuclei are on the edges and not in the center, unbranched
What type of muscle is this?
Skeletal, nuclei are on the edges and not in the center, unbranched
What type of muscle is this?
Cardiac, branching, striations, and nuclei are in the center.
