what do we call the simplest part of a muscle that is made up of tiny, parallel th selled? Enimusium sar

## Step 1<br />The question is asking for the simplest part of a muscle that is made up of tiny, parallel threads. This is a basic concept in biology, specifically in the study of muscle anatomy.<br />## Step 2<br />The simplest part of a muscle that is made up of tiny, parallel threads is called a sarcomere. Sarcomeres are the basic contractile units of muscle tissue.<br />## Step 3<br />Sarcomeres are composed of long, fibrous proteins that slide past each other when the muscles contract and relax. This is what allows muscles to move.