At the zone of overlap, each thin filament sits in a triangle formed by three thick filaments, and each thick filament is surrounded by six thin filaments.

Question

Quizplus · Accepted Answer

This is a correct statement about the anatomy of the sarcomere, the fundamental unit of muscle contraction. The zone of overlap refers to the region where thin filaments and thick filaments interdigitate, and the arrangement described in the statement ensures that there are enough binding sites for the cross-bridges that form between them during muscle contraction.

At the Zone of Overlap, Each Thin Filament Sits in a Triangle