Sliding Filament Theory and the Sacromere definitions Flashcards

The fundamental unit of muscle contraction, composed of overlapping actin and myosin filaments.

A thick filament protein with heads that pull on actin to shorten the sarcomere during contraction.

A thin filament protein that myosin pulls on to facilitate muscle contraction.

A thread-like protein that blocks myosin binding sites on actin, regulating muscle contraction.

A globular protein that binds calcium, moving tropomyosin to allow myosin-actin interaction.

An elastic filament protein that helps the sarcomere return to its original size post-contraction.

The boundary of a sarcomere, anchoring actin filaments and marking the sarcomere's ends.

The central line in a sarcomere that anchors myosin filaments.

The light band in a sarcomere containing only actin filaments.

The dark band in a sarcomere where actin and myosin overlap.

The central region of the A-band with only myosin, which diminishes during contraction.

A cylindrical organelle within muscle cells, composed of repeating sarcomeres.

A model explaining muscle contraction by the sliding of actin over myosin, shortening the sarcomere.

Protrusions on myosin filaments that bind to actin and pull it during contraction.

A structure that releases calcium to trigger muscle contraction by interacting with troponin.