Skeletal Muscle and Forces that Cause Movement

Now on to Skeletal Muscle and Movement!

Picture found HERE

Skeletal Muscle Properties: Are voluntary which means you must think of it to do it, which consists of millions of individual fibers.

There are 4 different skeletal muscle fibers your Fascicles, Perimysium, Epimysum and your Tendon.

Fascicels are a bundle of fibers grouped together.

Perimysium is the connective tissue surrounding the fascicles.

Epimysium is the tissue encasing the entire muscle.

Tendon is the passive part of the muscle that is made up of tough elastic tissue, your tendon is what attaches the muscle to bone.

Some Forces that cause movement are muscle contraction, gravity, outside forces and the same forces that cause movement can also prevent movement as well. Which is also known as Newton’s first law of motion!

Newton’s Fist Law of Motion– A body in motion stays in motion until acted on by an outside force.

There are 3 Muscle Actions!

Concentric Muscle Action: This is the shortening phase of a movement such as a pull up or curl, when muscles pull on bones to bring your body segments closer to each other and must generate enough force to overcome the force of gravity.

~Movements that are done opposite the pull of gravity are considered concentric~

Picture found HERE

Eccentric Muscle Action: (letting go) Eccentric muscle action occurs in the direction of gravity, when the muscle resists the pull of gravity in order to control the movement. When the muscle lengthens as it produces less force.

Isometric Muscle Action: (when you hold it) When muscle force is equal in magnitude to the opposing force and length does not change, also when force is produced without a change in length.

Picture found HERE

Agonist– The main muscle working

Antagonist– Opposite side of Agonist

Achieving Stability: There are many things that go along with achieving stability. The ability to maintain a balanced position after a disruption of balance, it requires the center of gravity to fall within the base of support, changing foot and body positions. A wide base of support and lower body position will increase stability and a narrow base and elongated body position will reduce stability






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