Sliding Filament Theory and the Sacromere definitions Flashcards
Sliding Filament Theory and the Sacromere definitions
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Sarcomere
The fundamental unit of muscle contraction, composed of overlapping actin and myosin filaments. Myosin
A thick filament protein with heads that pull on actin to shorten the sarcomere during contraction. Actin
A thin filament protein that myosin pulls on to facilitate muscle contraction. Tropomyosin
A thread-like protein that blocks myosin binding sites on actin, regulating muscle contraction. Troponin
A globular protein that binds calcium, moving tropomyosin to allow myosin-actin interaction. Titin
An elastic filament protein that helps the sarcomere return to its original size post-contraction. Z-disc
The boundary of a sarcomere, anchoring actin filaments and marking the sarcomere's ends. M-line
The central line in a sarcomere that anchors myosin filaments. I-band
The light band in a sarcomere containing only actin filaments. A-band
The dark band in a sarcomere where actin and myosin overlap. H-zone
The central region of the A-band with only myosin, which diminishes during contraction. Myofibril
A cylindrical organelle within muscle cells, composed of repeating sarcomeres. Sliding Filament Theory
A model explaining muscle contraction by the sliding of actin over myosin, shortening the sarcomere. Myosin Heads
Protrusions on myosin filaments that bind to actin and pull it during contraction. Sarcoplasmic Reticulum
A structure that releases calcium to trigger muscle contraction by interacting with troponin.
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