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What are the structures within the muscle fiber that shorten to cause skeletal muscle fiber contraction?
Myofibrils
What is sacrolemma?
The sarcolemma is the cell membrane of a muscle fiber. It surrounds and protects the muscle fiber and controls the movement of substances into and out of the cell. The sarcolemma plays a crucial role in muscle contraction and the transmission of nerve impulses to the muscle fiber.
How does muscle contraction occurs?
Muscle fiber generates tension through the action of actin and myosin cross-bridge cycling. While under tension, the muscle may lengthen, shorten, or remain the same. Although the term contraction implies shortening, when referring to the muscular system, it means muscle fibers generating tension with the help of motor neurons (the terms twitch tension, twitch force, and fiber contraction are also used).
What is the advantage of having many nuclei in a skeletal muscle fiber?
The ability to produce large amounts of the enzymes and structural proteins needed for contraction.
Chemical released to stimulate muscle contraction?
A signal is generated in the motor cortex of the brain, and travels down the spinal cord to the affected motor neurons. As the action potential travels down the axon of the final motor neuron, it causes calcium influx and exocytosis of acetylcholine-containing vesicles, releasing acetylcholine into the neuromuscular junction. From there, acetylcholine binds with receptors on the muscle fiber end plates, where it depolarizes the muscle fiber, causing contraction of the muscle.
What are the structures within the muscle fiber that shorten to cause skeletal muscle fiber contraction?
Myofibrils
What is shortening of a muscle fiber called?
a contraction human avatommy
What is the minimal strengh of stimulation needed to elicit a muscle fiber contraction called?
Threshold
What do you call a shortening of muscle fiber?
contraction
What describes the events of contraction in excitation-contraction coupling?
cross bridge formation "Excitation-contraction coupling" connects muscle fiber excitation to the muscle fiber contraction (cross bridge formation). During contraction, myosin heads form cross bridges many times-with each cross bridge generating a small amount of tension in the muscle fiber.
What best describes the events of excitation in excitation-contraction coupling?
cross bridge formation "Excitation-contraction coupling" connects muscle fiber excitation to the muscle fiber contraction (cross bridge formation). During contraction, myosin heads form cross bridges many times-with each cross bridge generating a small amount of tension in the muscle fiber.
What does contraction mean in medical terms?
contract or "contraction" is when a muscle fiber lengthens or shortens
What allows recoil of the muscle fiber when contraction ends?
Elastic filaments
The energy source that is directly responsible for muscle fiber contraction is?
ATP
What is the process of excitation contraction coupling?
cross bridge formation "Excitation-contraction coupling" connects muscle fiber excitation to the muscle fiber contraction (cross bridge formation). During contraction, myosin heads form cross bridges many times-with each cross bridge generating a small amount of tension in the muscle fiber.
What are all muscle cells called?
A single muscle cell is called a muscle fiber.
What is the function of cytoplasmic reticulum in the muscle fiber?
increases calcium influx in the muscle fibre, causing contraction.
