Final answer:
Water is the component that constitutes 56% of the total muscle weight in cattle, although c) proteins are also a key structural component of muscle fibers.
Step-by-step explanation:
The component that makes up 56% of total muscle weight in cattle is water. While muscle fibers do contain a significant amount of protein, which is critical for their structure and function, the majority of muscle composition is water. This is true for most living organisms, where water makes up a large proportion of muscle tissue. Additionally, proteins are complex molecules made up of amino acids that form the backbone of muscle fibers and play an essential role in bodily functions. It's important to understand that while protein is a major component of muscle fibers, water content is even higher.