The H zone

A) contains only myosin myofilaments.
B) contains only actin myofilaments.
C) contains both myosin and actin myofilaments.

H Zone

The region within a striated muscle fiber's sarcomere that contains only thick filaments and diminishes during muscle contraction.

Myosin Myofilaments

Filamentous proteins in muscle cells responsible for contraction by interacting with actin.

Actin Myofilaments

Protein filaments that, along with myosin, play a key role in the contraction of muscle cells by forming the thin filaments in the structure of muscle fibers.