Foot Proteins

Multiple Choice

Foot proteins

A) span the gap between a lateral sac of the sarcoplasmic reticulum and the adjacent T tubule
B) are believed to serve as Ca²⁺ channels
C) bind to and pull the thin filaments inward toward the A band's center during muscle contraction
D) span the gap between a lateral sac of the sarcoplasmic reticulum and the adjacent T tubule, and are believed to serve as Ca²⁺ channels
E) none of these