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Related Concept Videos

Torque Free Motion01:15

Torque Free Motion

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The torque-free motion refers to the movement of a rigid body in space when no external torques are acting upon it. This type of motion can be observed in environments where there are no external forces or frictions, like in outer space. For example, a rotation of Mars in space is a torque-free motion. Mars is an axisymmetric object, meaning it has an axis of symmetry along which it rotates, designated as the z-axis. The rotating frame of reference is defined such that the center of mass of...
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Journal Bearings01:23

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Journal bearings are mechanical components that support and provide lateral stability to rotating shafts and axles. They are crucial in reducing friction, wear, and vibration in machinery such as engines, turbines, and pumps. The principle behind journal bearings is forming a thin lubricant film between the bearing surface and the rotating shaft, which minimizes direct contact and reduces frictional forces.
To better understand the concept of journal bearings, consider a rope winch with dry or...
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Motor Units01:13

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The motor unit is a fundamental component of the neuromuscular system and plays a crucial role in coordinating muscle contractions. It consists of a somatic motor neuron, which connects and controls multiple skeletal muscle fibers, forming a single functional segment. The axon of the motor neuron branches out and establishes synaptic connections known as neuromuscular junctions with individual muscle fibers within the motor unit.
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Motor Units00:46

Motor Units

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A motor unit consists of two main components: a single efferent motor neuron (i.e., a neuron that carries impulses away from the central nervous system) and all of the muscle fibers it innervates. The motor neuron may innervate multiple muscle fibers, which are single cells, but only one motor neuron innervates a single muscle fiber.
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Torque01:10

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Torque is an important quantity for describing the dynamics of a rotating rigid body. We see the application of torque in many ways in the world, such as when pressing the accelerator in a car, which causes the engine to apply additional torque on the drivetrain. Here, we define torque and provide a framework to create an equation to calculate torque for a rigid body with fixed-axis rotation.
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G-protein Coupled Receptors01:21

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G-protein coupled receptors are ligand binding receptors that indirectly affect changes in the cell. The actual receptor is a single polypeptide that transverses the cell membrane seven times creating intracellular and extracellular loops. The extracellular loops create a ligand specific pocket which binds to neurotransmitters or hormones. The intracellular loops holds onto the G-protein.
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Related Experiment Video

Updated: Mar 17, 2026

A Friction Testing-Bioreactor Device for Study of Synovial Joint Biomechanics, Mechanobiology, and Physical Regulation
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A Friction Testing-Bioreactor Device for Study of Synovial Joint Biomechanics, Mechanobiology, and Physical Regulation

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Forum.

O Gordon1, J D Cantwell2, C Pettus2

  • 1a Forest Hills , New York.

The Physician and Sportsmedicine
|July 27, 2016
PubMed
Summary
This summary is machine-generated.

This section invites readers to share unique medical treatments, controversial opinions, or new trends in sports medicine. Submit your insights and interesting patient cases for publication.

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Area of Science:

  • Sports Medicine
  • Clinical Practice
  • Medical Education

Background:

  • The Physician and Sportsmedicine journal serves as a platform for reader engagement.
  • A dedicated "Forum" section encourages dialogue and the sharing of diverse perspectives.

Purpose of the Study:

  • To solicit reader contributions for the "Forum" section.
  • To foster a community of practice and knowledge exchange among healthcare professionals.

Main Methods:

  • Readers are invited to submit their ideas, experiences, and opinions.
  • Submissions may include novel treatment approaches for common medical problems.
  • Correspondence can address published articles or emerging trends in sports medicine.

Main Results:

  • The "Forum" aims to capture a wide range of reader viewpoints and clinical insights.
  • Contributions can be supported by illustrative figures to enhance understanding.

Conclusions:

  • The journal actively encourages reader participation to enrich its content.
  • The "Forum" serves as a vital sounding board for the sports medicine community.