Question

within myofibrils, thick filaments are composed of the protein while thin filaments primarily contain need help? review these concept resources. rate your confidence to submit your answer. high medium low reading © 2025 mcgraw hill all rights reserved. privacy center terms of use

Explanation:

In muscle myofibrils, thick filaments are made of myosin and thin filaments are mainly composed of actin. This is a fundamental concept in muscle - cell structure.

Answer:

First blank: myosin
Second blank: actin