How are we able to flex muscles without moving the associated limb?

Question

How are we able to flex muscles without moving the associated limb?

In: 20

Answer 1

Muscles are not “all flex or no flex” structures. There’s a near-infinite level of contraction. One can flex with just enough force for the entire muscle to become tense, but not enough force to move the limb/appendage. These are called “Isometric Contractions.”