How do muscles work in pairs to move the body quizlet?

A pair of muscles working together are called antagonistic pairs. Muscles are groups of tissue that can move parts of your body. Muscles relax and contract when one muscle pulls and moves your body part and if you want to do the opposite movement the opposite muscle contracts, allowing the first muscle to relax.

How do muscles work in pairs to move the body?

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.

Why do muscles work in pairs quizlet?

why must muscles work in pairs? Because muscle cells can only contract, not extend, skeletal muscles must work in pairs. While one muscle contracts, the other muscle in the pair relaxes to its original length. … once the muscle relaxes, its pair has to contract to bring it back to its original place.

How do bones and muscles work together to move the body quizlet?

Your bones and muscles work together through a series of impulses and signals communicated between the brain and skeletal muscles. In order to move, the nervous system then sends signals a skeletal muscle to contract. When the muscle contracts, this movement causes the attached bone to follow.

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Why do muscles always work in antagonistic pairs?

However, muscle contraction cannot act to push the bone back into its original position, and because of this, muscles work in ‘antagonistic muscle pairs’. One muscle of the pair contracts to move the body part, the other muscle in the pair then contracts to return the body part back to the original position.

What are the two classifications of muscles in your body?

Different types of muscle

  • Skeletal muscle – the specialised tissue that is attached to bones and allows movement. …
  • Smooth muscle – located in various internal structures including the digestive tract, uterus and blood vessels such as arteries. …
  • Cardiac muscle – the muscle specific to the heart.

What must skeletal muscles do to move quizlet?

Muscle move by contracting or becoming shorter that cause the bone to moves. Skeletal muscle work in pairs. When one muscle contracts, the other relaxes. Muscle always pull never push.

Why do we need two muscles together to move a bone?

Q5. Why are at least two muscles needed to move any joint in the body? A5. Generally, two skeletal muscles are joined to one bone, so that when one muscle contracts in one direction for enabling the bone to move in that specific direction; the other muscle becomes relaxed to facilitate the movement of the bone.