EXPLANATION
TEXT
Name : Rizky Aulia Ryalvin
Class : X
Science 2
Absent : 35
HOW
MUSCLES WORK
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1.
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General
Statement
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Muscles are tissues inside the body
that has function as the active movement organ. It contains two special
protein, which are actyn and myosin, so it can contract and relax. The
contraction and relaxation of muscles is moved the bone that connected with
the joints so it can create movement. At the end of the muscles are the
tendons. Tendons are the connective tissue that connect the bones and
muscles. Muscles which have two tendons at the end are called biceps. Meanwhile if it have three tendons at the
end are called triceps. There are two types of muscles works, there are
antagonistically and synergically.
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2.
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Explanation
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Two or more muscles that work in
opposition to another is called antagonistically. An example of antagonistic
muscles is found in the upper arm. We need two muscles to move the upper arm,
the biceps and the triceps. If the bicep contracts, the tricep will relax
(extend) so the lower arm is lifted. But if the tricep contracts, the bicep
will relax so the lower arm will straight again. In this case, the bicep
serve as a flexor (to bend) and the tricep as an extensor (to extend).
Two muscles that work in the same
way, which is to contract or extend together while moving the bones is called
synergistic muscles. An example of synergistic muscles is found in the palm
hand, called the pronator muscles. It is consist of two pronator muscles, the
pronator teres and pronator quadrates. It contract and relax together to lift
the palm of hand up or down. Other examples of synergistic muscles are found
in the chest, calf, stomach, and thigh muscles.
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3.
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Conclusion
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Thus, the muscles moved the body in
two ways, which are contract and relax in opposite (antagonistically) or same
way (synergically).
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