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While one muscle contracts, the other muscle in the pair returns to its original length.
The main muscle that bends your upper arm is called the Biceps brachii. The action is called flexion at the elbow. This muscle is on the "front" of the arm.
The muscle that acts against this one is called the Triceps brachii. Its' action is extension at the elbow. This muscle is on the "back" of the arm.
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Hollis Langosh
Wiki User
∙ 13y agoyour brain sends messages to your spinal cord which sends messages through you nerves to your muscles and they all move at the same time to work together. they contract and relax to enable you to move your arm.
Anonymous
Wiki User
∙ 9y agoWhile one muscle contracts, the other muscle in the pair returns to its original length.
The main muscle that bends your upper arm is called the Biceps brachii. The action is called flexion at the elbow. This muscle is on the "front" of the arm.
The muscle that acts against this one is called the Triceps brachii. Its' action is extension at the elbow. This muscle is on the "back" of the arm.
See the link below:
Wiki User
∙ 14y agoYour brain sends a signal to the joint in your elbow.
Wiki User
∙ 14y agoThe problem is not the muscles, it is your arm
Wiki User
∙ 13y ago-Flubbery Person
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Why muscles have to work in pairs?
Skeletal muscles only pull in one direction. For this reason they always come in pairs. When one muscle in a pair contracts, to bend a joint for example, its counterpart then contracts and pulls in the opposite direction to straighten the joint out again.
What are antagonist pairs of muscles?
pairs of muscles that work together
What are antagonist pairs are muscles?
pairs of muscles that work together
How do skeletal muscles work as a pair to bend and straighten the arm at the elbow?
When you bend your elbow, the biceps muscle contracts. At the same time the antagonist muscle, that is the triceps muscle relaxes in synchronized manner. Vise verse action take place, when you straighten the arm at the elbow. Triceps contracts and biceps relaxes.
What does muscles work in pairs mean?
Skeletal muscles are arranged as opposing pairs because, although they can shorten themselves by contracting, they have to be stretched back to their former length by other muscles. An example of opposing muscles is in the arm, where the biceps and triceps have opposite actions. As one muscle shortens, the other is stretched. The biceps contracts to bend the arm at the elbow while the triceps stretches. To straighten the elbow joint, the triceps contracts, while the biceps stretches.
How do our muscles move?
Muscles move body parts by contracting and then relaxing. Your muscles can pull bones, but they can't push them back to their original position. So they work in pairs of flexors and extensors. The flexor contracts to bend a limb at a joint.
Muscles that work in pairs are called what?
they are called antagonistic muscles.
What do skeletal muscles always work in?
Skeletal muscles work in pairs: flexors and extensors
How can muscles work in pairs?
ussually, one muscle in the pair bends part of the body.the other muscle straightens part of the body.
Do skeletal muscles always work in pairs?
false
Why do muscles need bones in order for the body to move?
AnswerThough not all muscles work in pairs, the general principle is that one muscle moves a bone one way, and the other muscle moves it the opposite way. Why? Because muscles can only pull, not push.For example, when you bend your arm, the biceps muscle pulls. When you want to straighten it, the biceps muscle cannot push it back. Instead, the triceps muscle that's on the back of the arm pulls in the other direction.
Do skeletal muscles always work in antagonist pairs?
false
