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B. isotonic contraction
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∙ 12y ago
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When a muscle shortens it means what?
It is called a concentric contraction. The muscle gets shorter in preparation to do work.
What is a contraction in which the muscle shorten and work is done?
This is muscle flexion or isotonic contraction.
When muscles lengthen?
The lengthening of a muscle is called 'relaxing'. As the SHORT muscles work antagonistically- when one contracts, one relaxes. Therefore as one muscle shortens the other lengthens. This is between the bicep and tricep and the hamstring and quadricep. When a muscle shortens it also thickens, this is why you can feel your muscle rise when you bring your arm towards you.
What is Lengthening of muscle is called?
The lengthening of a muscle is called 'relaxing'. As the SHORT muscles work antagonistically- when one contracts, one relaxes. Therefore as one muscle shortens the other lengthens. This is between the bicep and tricep and the hamstring and quadricep. When a muscle shortens it also thickens, this is why you can feel your muscle rise when you bring your arm towards you.
How does resistance training work?
Resistance training works by inducing muscle contraction. Doing this helps build muscles and strength. That is because muscle contraction generates tension on the muscle and forces it to move.
What is the process that takes place in a muscle cell to produce energy for it to work?
Contraction
When muscle cell demands energy to perform its work of contraction what happens to ATP?
ATP breaks down when a muscle cell demands energy to perform its work of contraction. ATP, which is a nucleoside triphosphate, stands for adenosine triphosphate.
What is a principal character in a literary work also a muscle which causes movement through contraction?
agonist
What is chemical work within cells powered by?
The contraction of a muscle cell is an example of mechanical work.
Why do muscles work in antagonistic pairs?
Because muscle can only contracts. The only way for it to lengthen is by having an outside force, ie, another muscle's contraction.
Whats the name of the chemical in the muscular system that causes contraction?
There's more than one chemical that causes contraction. The neurotransmitter (usually acetylcholine) is released from the nerve and excites the muscle. There is a change in calcium, sodium and potassium ion concentrations. ATP is used. All of these work together to produce a muscle contraction.
From which muscle does the heartbeat originate?
The heartbeat is caused by the contraction and relaxation of the heart muscle. The heart muscle is a special kind of muscle known as cardiac muscle, which is unique as it is both striated (strong), can work without tiring, and cannot be controlled (the movement of the muscle is automatic).
