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At what rate in muscle contraction does a single myosin head consumes?
Wiki User
∙ 11y ago
5 ATP per second
Wiki User
∙ 11y ago
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How do skeletal muscle fibers become multinucleated?
Being multinucleated enables anything to synthesize more protein. Also we know that skeletal muscle fibres are much longer than that of any other muscle fibre, so it needs a huge amount of actin and myosin protein to bring about required contraction of a muscle, as actin and myosin crossbridge is required for muscle contraction. Thus it can be postulated that this boon of being multinucleated is essential for a skeletal muscle to posses adequate amounts of actin and myosin for muscle contraction. By-- faireena singh ( mbbs first year cmc)
A single muscle contraction that lasts only a fraction of a second is called a?
A single contraction that lasts only a fraction of a second is called a muscle twitch. Its when the muscle seizes up for a quick pulse then relaxes.
Single muscle contraction that lasts only a fraction of a second is called?
A: A Twitch
The smallest functional unit of the muscle fiber?
The smallest functional unit of a muscle fiber is the sarcomere. Sarcomeres are composed of actin and myosin filaments arranged in a repeating pattern, allowing for muscle contraction and relaxation to occur. They are responsible for the striated appearance of skeletal muscle under a microscope.
Do smooth muscle have thick and thin filament?
Both do have actin and myosin.Within each skeletal muscle fiber are hundreds of lengthwise subdivisions called myofibrils.Myofibrils are made up of bundles of the protein filaments (myofilaments) that are responsible for muscle contraction: thin filaments: made of the protein actin, andthick filaments: made of the protein myosin.These are visible using a microscope.The internal organization of actin and myosin in smooth muscle is different from that in the striated muscles.Smooth muscle cells: are long and slender, are spindle shaped, with a single, central nucleus, have scattered myosin fibers, with more heads per thick filament and have actin filaments attached to dense bodies.These can not be seen using a microscope and that is why they are also called smooth muscle fibers.
Describe the major events of muscle fiber contraction?
Muscle fiber contraction is a complex process involving a number of cell parts and chemical substances that result in the sliding movement of the actin and myosin filaments and causes a contraction. A myosin filament is composed of protein strands with globular ends called cross-bridges that extend outward along the length of the filament. The actin filaments have ADP molecules attached to its surface that serve as active sites for linking the cross-bridges of the myosin filaments. Although the process is not completely understood, the sliding filament theory suggests that the myosin cross-bridge attaches to an actin active site and bends slightly, pulling the actin with it. It releases its attachment, straightens, and combines with another active site further down the actin filament, causing the sarcomere to shorten. When the nerve impulse reaches the distal end of its branch, acetylcholine is released into the gap. The acetylcholine diffuses rapidly across the motor end plate and combines with protein receptors in the sarcolemma. This causes a muscle impulse to be generated and pass in all directions over the entire sarcolemma, and through the T-tubules deep into the fiber. The S.R., which contains a high concentration of calcium ions, becomes more permeable and allows the ions to diffuse into the sarcoplasm. When a high enough concentration is present in the sarcoplasm, the linkages between the actin and myosin filaments occur and contraction takes place. The calcium ions are moved quickly back into the S.R. by an active transport system (calcium pump). When enough calcium ions have been removed from the sarcoplasm, the muscle relaxes. At the same time, the acetylcholine is rapidly decomposed by the enzyme cholinesterase. This prevents a single nerve impulse from causing a sustained contraction.
An example of eccentric muscle contraction is?
an efficient core routine consists of training in a single plane of motion-true or false
Why can the contraction of the muscle tissue cause your arm to bend but the contraction of a single muscle cell would have no effect?
It doesn't have "no effect" ... it's just too feeble to be noticed.
What are the three stages of muscle cell contraction?
A Muscle Twitch is a single contraction of skeletal muscle. The three distinct phases are latent, contraction, and relaxation. Latent Phase: Is the interval from the stimulus application until the muscle begins to contract (shorten). Note that there is no traced activity during this phase, but there are some electrical and chemical changes taking place during this phase. Contraction Phase: This phase is when the muscle fibers shorten, the tracings will show during this phase (a) peak(s). Relaxation Phase: This phase is represented by the downward curve in your tracings, this is when the muscle is going back to its original state of relaxation and the muscle will once again lengthen
What is the definition of Muscular Strength?
Muscular Strength is defined as "The maximum force that can be generated by a muscle or group of muscles in one singular contraction. Muscular strength is affected by the following factors. -Cross sectional area of the muscle -Angle of pull -Length -Age -Gender -Number of fibres (motor units) recruited -Speed of contraction, depends on (Slow or fast twitch muscle fibres) -Shape of muscle -Type of contraction
Term for the blood pumped in a single contraction?
Cardiac volume is the blood pumped in a single contraction
What is a twitch?
a twitch is a single stimulus-contraction-relax action sequence in a muscle fiber. They can vary in duration depending on the type of muscle, it's location, internal and external enviromental conditions and other factors.
