You are watching: When a muscle is unable to respond to stimuli temporarily, it is in which of the following periods?
An rise in the calcium ion level in the sarcoplasm starts the slide of the thin filaments. Once the level of calcium ions declines, slide stops.
TRUEMyosin heads drag actin toward the M line, shortening the ns bands, moving Z discs closer together and eliminating the H ar altogether.
When a muscle fiber contracts, the i bands lessen in size, the H area disappear, and the A bands perform not to decrease in length.
a. Tropomyosin is the receptor because that the motor neuron neurotransmitter.b. Tropomyosin serves together a convulsion inhibitor by blocking the myosin binding sites on the actin molecules.c. Tropomyosin is the chemical that activates the myosin heads.d. Tropomyosin serves together a convulsion inhibitor by prevent the actin binding sites on the myosin molecules.Tropomyosin blocks the binding web page on ACTIN molecules until motivated to relocate by Ca binding to troponin.
When a sarcomere contracts and also thin filaments move over special filaments you would expect to see ________.
a. The ns bands to show up widerb. The H zone to show up widerc. The i bands to appear smallerd. The A tape to appear darkerThe ns bands shrink as Actin moves toward the H zone, the center of the sarcomere.
Approximately 80% of a muscle fiber"s volume room the myofibrils. This characteristic reflects muscles capacity to ________.
a. Develop movement through contractile forceb. Generate and propagate action potentialc. Produce relatively high quantities of ATPd. Store oxygen molecules that deserve to be offered in aerobic respirationMyofibrils save on computer myofilaments (actin and myosin) i beg your pardon glide previous one an additional to contract the muscle, developing movement.
a. Striated muscle cells space long and also cylindrical with countless nuclei.b. Smooth muscle cells have T tubules.c. Cardiac muscle cell are uncovered in the love and huge blood vessels.d. Cardiac muscle cells have plenty of nuclei.Skeletal muscle (striated muscle cells) contain many nuclei and also are long and also cylindrical. Smooth muscle cells carry out NOT have t-tubules, but have caveolae instead. Cardiac muscles are discovered ONLY in the heart, not BVs. Cardiac cell are frequently uninucleate.
A convulsion in i beg your pardon the muscle does not shorten however its tension boosts is referred to as isometric contraction.
If offered the precise same quantity of ATP, i m sorry of the 3 fiber types would be able to contract for the longest quantity of time?
a. Both rapid glycolytic and also fast oxidative fibersb. Slow oxidative fibersc. Rapid glycolytic fibersd. Quick oxidative fibersSlow oxidative fibers are fatigue resistant yarn which contract for long durations with high endurance.
a. Storing energy that will be moved to ADP come resynthesize ATPb. Developing a chemical compound with actinc. Inducing a conformational readjust in the myofilamentsd. Developing a momentary chemical compound with myosinCreatine phosphate, a high energy molecule in muscle cells, produce ATP while the metabolic pathways readjust to the suddenly high ATP demands.
a. Rapid glycolytic fibers onlyb. Fast oxidative yarn onlyc. Quick glycolytic and fast oxidative fibersd. Quick oxidative and slow oxidative fibersBoth fast/slow oxidative fibers need oxygen. Myoglobin is an oxygen moving pigment found in muscle cells
a. Over there are an ext thick filaments than thin filamentsb. There space noncontractile intermediary filaments that attach to dense bodies in ~ the cellc. It shows up to lack troponind. There space no sarcomeresSmooth muscle is distinctive in that is has intermediate filaments which affix to dense bodies, attaching the cytoplasmic skeleton come the ECM. It additionally has calmodulin instead of troponin, and also lacks sarcomeres (its myofilaments are randomly patterned). However, the does not have much more thick 보다 thin filaments-- in fact, it has about 1:13 thick:thin ratio)
a. The emotion of well-being following exerciseb. A state of sustained partial contractionc. The problem of athletes after intensive trainingd. The ability of a muscle to efficiently cause skeletal movementsMuscle ton is the constant partial convulsion of muscles.
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a. Increasing the stimulation as much as the maximal stimulusb. Raising stimulus over the treppe stimulusc. Increasing stimulus above the thresholdd. Recruiting little and medium muscle fiberThe maximal economic stimulation is the strongest stimulus that boosts contractile force. This the point at which every muscle motor units are recruited (including small and big muscle fibers). When recruiting yarn which rise in size contributes to the pressure of a contraction, the stimulation of maximal economic stimulation will speak to into play all of the fibers in a muscle.