I think it's hinge I'm not so sure though :/
I believe the correct answer from the choices listed above is the first option. Every human body has an uncountable number of this basic unit of a muscle known as muscle fibers. <span>A muscle fiber is composed of many fibrils, which give the cell its striated appearance. Hope this answers the question.</span>
A women's first menstrual period is called <span>menarche.</span>
Narcotic affect the brain Because of how opiates affect the brain, when someone takes these drugs they attach to the body's many opioid receptors