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Single muscle contraction that lasts only a fraction of a second is called?
A: A Twitch
What is second stimulus before relaxation causes increased force called?
The phenomenon you are referring to is called the second stimulus before relaxation, which causes increased force, is known as the treppe effect or the staircase phenomenon. This is characterized by the successive increase in muscle contraction force when muscle fibers are stimulated with increasing frequency.
What summation occurs when a second contraction is added to the irst before complete relaxation?
When a second contraction occurs before complete relaxation of the first, it leads to a phenomenon known as "tetanus." This summation of muscle contractions increases the overall force produced by the muscle, as the second contraction adds to the tension generated by the first. As a result, the muscle remains in a more sustained and powerful state of contraction, rather than returning to its resting state. This is critical for activities requiring sustained muscle force, such as lifting or maintaining posture.
At what rate in muscle contraction does a single myosin head consumes?
5 ATP per second
Does a muscle contract the instant it is stimulated?
no, the muscle does not begin to contract the instant it is stimulated, rather a fraction of a second later!
What is a fraction of a minute called?
Second
A muscle is stimulated and exhibits a contraction twitch Before this twitch is over it is stimulated again and a second twitch occurs piggyback on the first one and causes a higher contraction?
summation
What is contraction period?
Period of Contraction is the second stage of a muscle twitch, when cross bridges are active, from the onset to the peak of tension development, and the myogram tracing rises to a peak. This period lasts 10-100 ms. If the tension (pull) becomes great enough to overcome the resistance of a load, the muscle shortens
What is the difference between myoclonus and clonic spasm?
Myoclonic seizures involve an extremely brief (< 0.1 second) muscle contraction and can result in jerky movements of muscles or muscle groups.Clonic seizures are myoclonus that are regularly repeating at a rate typically of 2-3 per second
Do Every muscle fiber has several motor end plates that neurons attach to yes or no?
Muscle fibres are connected to neurones on either a 1:1 ratio (such as fingers, where precise muscle control is needed) whereas some muscle fibres are connected to neurones in a 1 neurone:several muscle fibres ratio. The second occurs where precise movement is not needed, such as the calf muscle, where a stimulus needs to cause a large and synchronised contraction of muscles as opposed to precise contraction of certain individual fibres.
Why does the second contraction show higher than the first one on a monitor?
The short answer is residual calcium. Calcium mediates both transmitter release on the presynaptic side of the neuromuscular junction (where nerve meets muscle spindle) and calcium also mediates binding of the actin-myosin bridges that cause muscle contraction.Here is a good source http://www.answers.com/neuromuscular+junctionThe longer answer is much more interesting but takes some technical background. For a starters try a neurobiology textbook.
What is the second name for heart?
Another name for the human heart is a cardiac muscle.
