Question

required information
the thick filaments of the sarcomere are made up mostly of the protein ____________.
multiple choice
actin
myosin
myoglobin
tropomyosin

Explanation:

In muscle - sarcomeres, thick filaments are mainly composed of myosin. Actin makes up thin filaments. Myoglobin is an oxygen - binding protein in muscle cells and troponin is part of the thin - filament regulatory complex.

Answer:

myosin