Contraction of muscle fibers in skeletal muscle is initiated bythe uptake of calcium by the transverse (T) tubules.O the release of calcium from the transverse (T) tubules.O the release of calcium from the mitochondria.the uptake of calcium by the sarcoplasmic reticulum.the release of calcium from the sarcoplasmic reticulum.

Movement refers to any change in body position. It is a fundamental characteristic of living beings.…

Contraction of muscle fibers in skeletal muscle is initiated by the uptake of calcium by the transverse (T) tubules. O the release of calcium from the transverse (T) tubules. the release of calcium from the mitochondria. the uptake of calcium by the sarcoplasmic reticulum. the release of calcium from the sarcoplasmic reticulum.

Contraction of muscle fibers in skeletal muscle is initiated by the uptake of calcium by the transverse (T) tubules. O the release of calcium from the transverse (T) tubules. the release of calcium from the mitochondria. the uptake of calcium by the sarcoplasmic reticulum. the release of calcium from the sarcoplasmic reticulum.

Human Physiology: From Cells to Systems (MindTap Course List)

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter8: Muscle Physiology

Section: Chapter Questions

Problem 11RE

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Similar questions

Nerve impulses first stimulate a skeletal muscle fiber at _______. a. T tubules b. sarcomeres c. neuromuscular junctions d. actin binding sites
The _____ is the basic unit of muscle contraction. a. myofibril b. sarcomere c. muscle fiber d. myosin filament
Depolarization of the sarcolemma means ________. the inside of the membrane has become Less negative as sodium ions accumulate the outside of the membrane has become less negative as sodium ions accumulate the inside of the membrane has become more negative as sodium ions accumulate the sarcolemma has completely lost any electrical charge
Figure 38.37 Which of the following statements about muscle contraction is true? The power stroke occurs when ATP is hydrolyzed to ADP and phosphate. The power stroke occurs when ADP and phosphate dissociate from the myosin head. The power stroke occurs when ADP and phosphate dissociate from the actin active site. The power stroke occurs when Ca2+ binds the calcium head.
The release of calcium ions initiates muscle contractions. Watch this video (http://openstaxcollege.org/l/calciumrole) to learn more about the role of calcium. (a) What are â€œT-tubulesâ€� and what is their role? (b) Please also describe how actin-binding sites are made available for cross-bridging with myosin heads during contraction.
Every skeletal muscle fiber is supplied by a motor neuron at the NMJ. Watch this video (http://openstaxcollege.org/l/skelmuscfiber) to learn more about what happens at the neuromuscular junction. (a) What is the definition of a motor unit? (b) What is the structural and functional difference between a large motor unit and a small motor unit? Can you give an example of each? (c) Why is the neurotransmitter acetylcholine degraded after binding to its receptor?
Explain why (a) calcium ions and (b) ACh are vital for muscle contraction.
Watch this video (http://openstaxcollege.org/l/micromacro) to learn more about macro- and microstructures of skeletal muscles. (a) What are the names of the junction points between sarcomeres? (b) What are the names of the subunits within the myofibrils that run the length of skeletal muscle fibers? (c) What is the â€œdouble strand of pearlsâ€� described in the video? (d) What gives a skeletal muscle fiber its striated appearance?
Motor neurons innervate muscle fibers at specialized synapses called_______ . The release of acetylcholine at these synapses ultimately triggers an action potential in the muscle fiber, which invades the interior of the fiber through_____ and stimulates the release of calcium ions from the_______ .
When a(n) __________ moves along the sarcolemma, the membrane potential changes along the membrane due to the opening and closing of voltage-gated Na+ and K+ channels. action potential sarcoplasmic reticulum calcium ion sarcomere