HESI A&P Muscular System

Muscles produce movement by contracting in response to ______ _______.

Muscle contraction results from the sliding together of _____ & ______ myofilaments within the muscle cells or fibers.

Each muscle cell consists of myofibrils, which in turn are made up of still smaller units called _________.

What 2 elements must be present for muscle cell contraction?

Nerve impulse from motor neuron causes the release of ______ ions from the Sarcoplasmic Reticulum.

Calcium ions attach to T-Tcomplex on the  ________ filaments, moving it aside so that cross-bridges can form between actin & myosin.

Using energy supplied by ATP, the filaments slide together to produce ___________.

The skeletal muscles, which also make up the muscular system, are also called __________ muscles because they work under conscious control.

Muscle that executes a given movement is called a _______ mover.

Muscle that produces the opposite as a prime mover is called the _________.

Muscles that work in cooperation with the prime mover are known as __________.

Flexors

Extensors