Which of the following statements regarding the sliding filament model is false?

A) Actin and myosin do not shorten during contraction.
B) Both actin and myosin myofilaments shorten during contraction.
C) The sarcomere shortens.
D) The I band and H zones become narrower during contraction.
E) The A band remains constant in length.

Sliding Filament Model

A theory describing the mechanism of muscle contraction, where actin and myosin filaments slide past each other to shorten the muscle fiber length.

Sarcomere

The basic unit of a muscle's cross-striated myofibril, responsible for the muscle's contractile properties.

Actin

A protein that forms filaments and is involved in various types of cell movement and structure, including muscle contraction and cell division.