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The biceps flexes the arm it does not extend it (straightens). The triceps brachii extends the arm. They do work together. If one is damaged and doesn't work as it should, the movement will be "jerky" and not smooth.

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Marley Williamson

Lvl 10
2y ago
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Wiki User

6y ago

The biceps contract to pull up the arm, and then to relax, while the triceps lower the arm. Muscles work in pairs to move the articulate skeleton parts.

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Anonymous

Lvl 1
3y ago
lame answer like you

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Wiki User

6y ago

The movement would be 'jerky' and not at all smooth.

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Q: Why the biceps alone cannot make the arm straighten?
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where in the muscles would you find triceps?

They are the opposite muscle to the biceps. If you bend your arm to make the muscle on the top (the biceps) bulge, the muscle on the bottom (the triceps) relaxes. The triceps is on the back of your arm, and is used to straighten the elbow.


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Women have biceps (brachii) in the arms just as men do. They don't work them to make them as large. Some do but most don't work out that way. Their muscles seem leaner and flatter.


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