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Related Concept Videos

Hypodermis01:02

Hypodermis

The hypodermis (the subcutaneous layer or superficial fascia) is present directly below the dermis. It connects the skin to the underlying fascia (fibrous tissue) of the bones and muscles. It is not strictly a part of the skin, although the border between the hypodermis and dermis can be difficult to distinguish. The hypodermis consists of well-vascularized, loose, areolar connective tissue and adipose tissue, which functions as a mode of fat storage and provides insulation and cushioning for...
Exercise and Muscle Performance01:27

Exercise and Muscle Performance

Exercise induces a range of adaptations in muscle tissue, depending on the type and duration of activity. Such physical training can be broadly categorized into two types: endurance exercises and resistance exercises.
Endurance exercises
Endurance exercises involve running, swimming, or cycling, which require repetitive movements with low force output. When a person engages in endurance exercise, a few noticeable changes occur in their skeletal muscles. For instance, the number of capillaries...
Classification of Skeletal Muscle Fibers01:48

Classification of Skeletal Muscle Fibers

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.
Slow-Twitch Muscle Fibers
Slow oxidative, muscle fibers appear red due to large numbers of capillaries and high levels of...
Mass and Weight01:19

Mass and Weight

Mass and weight are often used interchangeably in everyday conversation. For example,  medical records often show our weight in kilograms, but never in the correct units of newtons. In physics, however, there is an important distinction. Weight is the pull of the Earth on an object. It depends on the distance from the center of the Earth. Weight dramatically varies if we leave the Earth's surface, unlike mass, which does not vary with location. On the Moon, for example, the acceleration due to...
Mass and Weight01:19

Mass and Weight

Mass and weight are often used interchangeably in everyday conversation. For example,  medical records often show our weight in kilograms, but never in the correct units of newtons. In physics, however, there is an important distinction. Weight is the pull of the Earth on an object. It depends on the distance from the center of the Earth. Weight dramatically varies if we leave the Earth's surface, unlike mass, which does not vary with location. On the Moon, for example, the acceleration due to...
Muscle Recovery and Fatigue01:24

Muscle Recovery and Fatigue

Muscle fatigue refers to the decline in a muscle's ability to maintain the force of contraction after prolonged activity. It primarily stems from changes within muscle fibers. Even before experiencing muscle fatigue, one may feel tired and have the urge to stop the activity. This response, known as central fatigue, occurs due to changes in the central nervous system, namely the brain and spinal cord. While there is no single mechanism that induces fatigue, it may serve as a protective response...

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Related Experiment Video

Updated: Jun 17, 2026

Decellularization-Based Quantification of Skeletal Muscle Fatty Infiltration
10:37

Decellularization-Based Quantification of Skeletal Muscle Fatty Infiltration

Published on: June 9, 2023

Tipping the scale: muscle versus fat.

Matthew S Rodeheffer1

  • 1Section of Comparative Medicine, Yale Stem Cell Center, Yale University School of Medicine, New Haven, CT 06520, USA. matthew.rodeheffer@yale.edu

Nature Cell Biology
|January 19, 2010
PubMed
Summary
This summary is machine-generated.

Skeletal muscle degeneration involves adipocytes and scar tissue. New studies show bipotent progenitors in muscle generate these cells and aid muscle regeneration.

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Last Updated: Jun 17, 2026

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Area of Science:

  • Muscle regeneration
  • Cellular biology
  • Tissue repair

Background:

  • Skeletal muscle degeneration leads to the formation of adipocytes and scar tissue.
  • The cellular origins of these non-muscle cells within the muscle environment were previously unclear.

Discussion:

  • Two recent studies identify a population of bipotent progenitor cells residing within skeletal muscle.
  • These progenitors are distinct from the muscle lineage and can differentiate into both adipocytes and fibroblasts.
  • The findings challenge previous assumptions about cell sourcing during muscle repair.

Key Insights:

  • Bipotent progenitors in skeletal muscle give rise to adipocytes and fibroblasts.
  • These progenitor cells are crucial for stimulating muscle mass restoration during regeneration.
  • This discovery offers new insights into the cellular mechanisms underlying muscle repair and fibrosis.

Outlook:

  • Further research could explore therapeutic strategies targeting these bipotent progenitors for enhanced muscle regeneration.
  • Understanding the signaling pathways that regulate these progenitors may lead to treatments for muscle degenerative diseases.
  • Investigating the precise mechanisms by which these cells stimulate muscle regrowth is a key future direction.