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Related Concept Videos

Classification of Skeletal Muscle Fibers01:48

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Skeletal muscles continuously produce ATP to provide the energy that enables muscle contractions. Skeletal muscle fibers can be categorized into three types based on differences in their contraction speed and how they produce ATP, as well as physical differences related to these factors. Most human muscles contain all three muscle fiber types, albeit in varying proportions.
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Overview of Skeletal Muscle01:15

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Skeletal muscles are composed of a bundle of muscle fibers and are attached to bones through tendons. Each skeletal muscle fiber is a single muscle cell. The sarcolemma, the plasma membrane of a skeletal muscle cell, consists of a lipid bilayer and glycocalyx that supports muscle fibers. The sarcolemma extends into the muscle cells to form tubular structures called transverse or T-tubules. Each side of the T-tubules consists of a membrane-bound structure called the sarcoplasmic reticulum,...
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The period of muscle contraction primarily influences the duration of stimulation at the neuromuscular junction (NMJ), the presence of free calcium ions in the sarcoplasm, and the availability of energy or ATP to support contractions.
When an action potential reaches the axon terminal, it depolarizes the membrane and opens voltage-gated sodium channels. Sodium ions enter the cell, further depolarizing the presynaptic membrane. This depolarization causes voltage-gated calcium channels to open....
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The most apparent functions of the skeletal system are support, protection, and movement. However, bone tissue also performs several other critical metabolic functions. For one, the bone matrix acts as a reservoir for a number of minerals important to the functioning of the body, especially calcium and phosphorus. These minerals, present in the bone tissue, can be released back into the bloodstream when required. Calcium ions, for example, are essential for muscle contractions and controlling...
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Peroxisomes and mitochondria are two important oxygen-utilizing organelles in eukaryotic cells. Mitochondria carry out cellular respiration—the process that converts energy from food into ATP. Peroxisomes carry out a variety of functions, primarily breaking down different substances, such as fatty acids.
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Disorders of the Skeletal Muscle01:28

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The clinical conditions affecting the skeletal muscle tissue are broadly categorized as musculoskeletal and neuromuscular disorders.
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Measurement of Protein Import Capacity of Skeletal Muscle Mitochondria
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Mitochondria-Targeted Antioxidants and Skeletal Muscle Function.

Sophie C Broome1, Jonathan S T Woodhead2, Troy L Merry3,4

  • 1Discipline of Nutrition, Faculty of Medical and Health Sciences, The University of Auckland, Auckland 1023, New Zealand. s.broome@auckland.ac.nz.

Antioxidants (Basel, Switzerland)
|August 12, 2018
PubMed
Summary

Mitochondria-targeted antioxidants show promise for improving skeletal muscle function and insulin sensitivity. However, benefits depend on the specific antioxidant type and its mechanism, not just mitochondrial targeting.

Keywords:
antioxidantmitochondriaoxidative stressreactive oxygen speciesskeletal muscle

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Area of Science:

  • Mitochondrial biochemistry
  • Skeletal muscle physiology
  • Oxidative stress and cellular signaling

Background:

  • Mitochondria are a primary source of reactive oxygen species (ROS) in skeletal muscle.
  • Excessive ROS can cause oxidative damage, impairing muscle function.
  • ROS also play crucial roles in cellular signaling, necessitating careful antioxidant use.

Purpose of the Study:

  • To review the effects of mitochondria-targeted antioxidants on skeletal muscle function.
  • To evaluate the potential of these antioxidants in preventing or treating muscle dysfunction and damage.
  • To understand the nuances of antioxidant efficacy beyond mere mitochondrial targeting.

Main Methods:

  • Literature review of studies investigating mitochondria-targeted antioxidants.
  • Analysis of effects on mitochondrial capacity, function, and insulin sensitivity.
  • Examination of impact on age-related muscle decline and disease-associated damage.

Main Results:

  • Mitochondria-targeted antioxidants generally improve mitochondrial capacity and function.
  • Positive effects observed on insulin sensitivity and age-related muscle function decline.
  • Benefits are contingent on the specific antioxidant and its mechanism of action.

Conclusions:

  • Mitochondria-targeted antioxidants can be beneficial for skeletal muscle health.
  • The efficacy is determined by the antioxidant's type and mechanism, not solely its localization.
  • Further research is needed to optimize the use of these compounds for therapeutic purposes.