Muscular System #1

Front

A cylindrical organelle running the length of the muscle cell, containing Actin and Myosin filaments.

Back

Myofibril

Front

A section of a myofibril from one z-disc to another z-disc. The contractile unit.

Back

Sarcomere

Front

The thin protein filament anchored to a z-disc

Back

Actin

Front

The thick protein filament with protruding "heads"

Back

Myosin

Front

A protein which acts as a "lock," keeping actin blocked until it binds to calcium

Back

Tropoinin

Front

The "key" that unlocks troponin to allow actin and myosin to bind.

Back

Calcium

Front

Contraction where myofilaments slide and the muscle shortens

Back

Isotonic

Front

Contraction where myofilaments do not slide due to muscles being pitted against something immovable.

Back

Isometric

Front

Attachment to the immovable or less movable bone

Back

Origin

Front

Attachment to the movable bone

Back

Insertion