Chapter 10.2, Problem 5QC

Summary Introduction

To review:

The structures of the thick, thin and elastic filaments, and the proteins that make them up.

Introduction:

In the sarcoplasm, myofibrils are the most abundant organelles. The myofibrils are surrounded by the sarcoplasmic reticulum. Calcium ions are released and stored by the sarcoplasmic reticulum for the muscle contraction process. Thousands of myofilaments make up the myofibril.