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No, they can also contract, they do every time you use them to move an arm, a leg, etc..
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∙ 14y ago
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Which muscles extend or straighten a body part?
Extensor muscles extend or straighten a body part.
Can muscle cells extend?
only contract, never extend. if it looks like it is extending, that's just another muscles contraction.
Is their only one muscle that bends and straitens the arm?
There are several muscles involved in bending the arm, and several others used to extend the arm. Muscles can only PULL; they cannot push or twist.
What muscle can do?
Muscles can contract and shorten
What muscles extend the spine?
The erector spinae
What muscles extend flex the arm?
i done no
Which muscles extend your elbow?
triceps brachii
What is it called when muscles are pulled?
Hyper extend
Group of muscles that extend the leg?
There are four muscles that extend the leg. vastus lateralis, vastus medialis, vastus intermedius and rectus femoris.
What Muscle extends in any movement?
None. Muscles only contracts. In order to extend, the muscle on the opposite movement has to contract. For example, the biceps help flex the elbow, but it does not extend the elbow; the triceps does that.
What group of muscles allows you to extend your arm?
Triceps
What will happen if only 1 muscle is used to bend and straighten the arm?
Two muscles are needed, one to extend the other to close
