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Related Concept Videos

Classification of Skeletal Muscle Fibers01:48

Classification of Skeletal Muscle Fibers

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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
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The Functions of the Skeletal System01:22

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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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The skeletal system is the central framework of the body, consisting of different connective tissues: bones, cartilage, tendons, and ligaments.
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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.
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Related Experiment Video

Updated: Feb 12, 2026

Author Spotlight: A Novel 3D-Printed Titanium Implant for Minimally Invasive Treatment of Hip Dysplasia in Young Dogs
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Skeletal dysplasias: 38 prenatal cases.

I Witters1, Ph Moerman, J P Fryns

  • 1Center for Human Genetics, University of Leuven, Belgium. Ingrid.Witters@uz.kuleuven.ac.be

Genetic Counseling (Geneva, Switzerland)
|November 11, 2008
PubMed
Summary

Prenatal diagnosis of skeletal dysplasias accurately predicted lethality but identifying specific types was challenging. Of 38 cases, only 25 received a correct antenatal diagnosis, highlighting areas for improvement in diagnosing these rare conditions.

Area of Science:

  • Medical Genetics
  • Prenatal Diagnosis
  • Skeletal Dysplasias

Background:

  • Skeletal dysplasias are a group of congenital disorders affecting bone and cartilage development.
  • Accurate prenatal diagnosis is crucial for genetic counseling and management decisions.

Purpose of the Study:

  • To evaluate the accuracy of prenatal diagnosis for skeletal dysplasias over a 10-year period.
  • To assess the reliability of predicting lethality and specific diagnoses.

Main Methods:

  • Retrospective analysis of antenatal skeletal dysplasia cases from a genetic database (1996-2005).
  • Inclusion of cases with invasive prenatal diagnosis (chorionic villus sampling/amniocentesis).
  • Final diagnosis confirmation through fetopathology, radiography, and molecular testing.

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Main Results:

  • 46 cases of antenatal skeletal dysplasia diagnosed; follow-up available for 38.
  • Mean gestational age at diagnosis was 23 weeks; 65.8% diagnosed by 24 weeks.
  • Lethality correctly predicted in 71% of cases; specific diagnosis accuracy was 65.8% (25/38 cases).
  • Commonly diagnosed conditions included osteogenesis imperfecta type II, thanatophoric dysplasia, and achondroplasia.

Conclusions:

  • Antenatal prediction of lethality for skeletal dysplasias in this cohort was accurate.
  • Accurate antenatal diagnosis of the specific type of skeletal dysplasia remains challenging.
  • Further advancements in diagnostic techniques are needed to improve specificity.