More Information about the Muscles & Pictures

The attachment of myosin to actin molecules is stimulated by the release of calcium inside the muscle cells. ATP in the muscle provides energy needed to pull the actin filaments inward.
**KEY terms**
Actin are contractile filaments made of protein and found in the cytoskeleton.
Myofibrils are bundles of contractile myofilaments in the skeletal muscle cells.
Myosin is a protein filament found in many cells in the microfilamentous network also in muscle cells.
Sarcomeres are functional units of the muscle cells and ti consists of myosin, actin, and myofilaments.
Sarcoplasmic reticulum of the smooth endoplasmic reticulum of teh skeletal muscle fiber is responsible for storing and releasing calcium ions that are absolutely necessary for muscle contractions.
Schwann cell is a neuroglial cell or supportive cell in the nervous system and it is responsible to the myelin sheath.
Each of the pictures below show the important breakdown levels of a muscles in the body. From the muscle fibers to the cross bridging for contraction. I couldn't get this to post with the rest of the pictures or otherwise they would have been noted under each picture.
When thinking about muscles working together to move an arm, leg, or move the lips to talk I find it amazing. The process that takes place in order to see it happen and how quickly these impulses are processed. It is not as simple as my brain telling my arm to move but it goes much deeper then that. It requires nerve impulses, actin and myosin filaments working together with the proper mixture of ingredients to spark the necessary energies to stimulate muscle contractions. I found it completely amazing to learn the ins and outs of muscles and how they enable us to move our body parts and positions.