Chapter 47.1, Problem 1R

Summary Introduction

To review:

The reason due to which isotropic (I) () band and H zone get smaller, while no change in anisotropic (A) band is observed during the contraction of the skeletal muscle

Introduction:

The basic unit of every organ is cell; however, the specific cells themselves are composed of some simple units, like muscle cells are composed of the myofibrils. The myofibrils contain actin (thin) and myosin (thick) bundles, which are organized in a well-ordered fashion. The myofibril, in turn, is composed of the sarcomeres which are repeated in an order.