Which of the Following Statements Are True of the Structure

Which of the following statements are true of the structure of sarcomeres? (Read carefully and select all of the correct statements.)

A) Myosin filaments are in the center of the sarcomere.
B) The T tubules of the sarcolemma are close to the sarcoplasmic reticulum.
C) Troponin and tropomyosin are inhibiting proteins.
D) The sarcoplasmic reticulum stores sodium ions that stimulate contraction.
E) Actin filaments are attached to the Z lines in the center of the sarcomere
F) The contracting proteins are actin and myosin.