A)Fill in the blanks below regarding sarcomeres: In a sarcomere, thin filaments are composed of.................  proteins while thick filaments are composed of..................  proteins. The H-band/zone of a sarcomere contains only........................  filaments. Before a muscle contraction, calcium ions are stored in the .................. that surrounds the sarcomere. When released, calcium binds to.................  proteins to displace them so myosin can bind to actin.

Define and describe the function of a sarcomere.

A sarcomere contracts when a) Thin filaments (actin) slide b) Thick filaments (myosin) slide c) Thin filaments (actin) contract d) Thick filaments (myosin ) contract

Can you match the sacromere anatomy with the proper answer from the list below the table graph? Sarcomere Anatomy Description/Reaction Thin Filaments ? Thick Filaments  ? A Band  ? I Band ? M Line ? H Zone ? Z Disc ? A) G-Actin, F-Actin, Troponin, Tropomyosin B) Myosin C) Bisected by the M Line, this area shows only the thick filaments without any thin filamentous overlap D) The point of origin for myosin filaments found in the center of the sarcomere E) An area in the center of the sarcomere marked by the entire length of the thick filaments F) A space between sarcomeres with the z-disc in the center; this region shows Actin's anchorage points and extension without myosin overlap G) Anchoring point for the thin filaments