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When our skeletal muscles in our bodies contract they shorten by a process known as the Sliding Filament Theory proposed by Huxley in the 1960's. What happens on a microscopic level is that short sections inside the muscle cells called sacromeres are arranged in long parallel rows and bundled together as long cords called myofibrils. As an action potential, electrical impulse, travels down the cell membrane of the muscle cell, the sacrolemma, the impulse causes calcium to be released and unlock binding sites on the actin filaments so that the myosin heads can attach and pull the actin filaments closer together. These actin and myosin filament are inside all the sarcomeres. When the energy stored in the ATP (adenosine triphosphate) molecule is released, the result is muscle contraction. On a larger scale the muscle has an origin, a an attachment to a more stable structure, usually to bone. And another end that is attached to a structure that is less satble and can move more easily. This is usually another bone and called the insertion site. When the muscle contracts, the joint between the two attachments acts as a lever and causes motion that moves that part of the body.
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What happens to the length of a muscle when it contracts?
When a muscle contracts, it shortens in length.
What happens when the biceps muscle contracts?
When the bicep contracts the triceps relax
When one muscle contracts what happens to the opposing muscle?
When one muscle in a pair contracts the other expands.
What happens when the muscle contracts?
Points The toes
What happens when an entire muscle contracts strongly and stays contracted?
when a muscle cramps
If one muscle contracts what happens to the other one?
relax
What happens to the muscle fibers in your biceps when you bend your arm?
it contracts
When the muscle contracts what happens to the tendon and bone?
When the muscle contracts, the tendon pulls on the bone to create movement. The tendon is the connective tissue that attaches the muscle to the bone, so when the muscle contracts, it exerts force on the tendon, which in turn moves the bone.
What is an Isotonic Contractions?
Isotonic contractions. This happens when the muscle shortens as it contracts
When a muscle contrats what happens to its opposite muscle?
depends on which muscle but the opposite muscle sometimes contracts aswell to stabalize the joint some relaxes ...
What happens when a muscle contracts?
when the muscle shortens (contracts), the two bones come closer together, isometric contraction excepted.
When you flex your arm muscle what happens?
The muscle in your arm contracts. The muscle on the other side of your arm, opposite from the side that you are flexing, stretches.
