Question

the structural theory that explains how a muscle fiber contracts is called the ______ theory. action - myosin interaction excitation - contraction coupling muscle contraction neuromuscular sliding filament

Explanation:

The sliding - filament theory describes how muscle fibers contract. It states that during muscle contraction, thin filaments (actin) slide past thick filaments (myosin) within the muscle fiber. Action - myosin interaction is part of the process but not the full theory name. Excitation - contraction coupling is about the link between electrical excitation and muscle contraction, not the structural theory. Muscle contraction is a general term. Neuromuscular refers to the connection between nerves and muscles, not the structural contraction theory.

Answer:

E. sliding filament