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Motor Units

Motor Units

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.

Motor Units

Motor Units

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.
Motor units come in different sizes, with smaller units...

Heat Engines

Heat Engines

A heat engine is a device used to extract heat from a source and then convert it into mechanical work used for various applications. For example, a steam engine on an old-style train can produce the work needed for driving the train.
Whenever we consider heat engines (and associated devices such as refrigerators and heat pumps), we do not use the standard sign convention for heat and work. For convenience, we assume that the symbols Qh, Qc, and W represent only the amounts of heat transferred...

Motor Unit Stimulation

Motor Unit Stimulation

When the neuron of a motor unit fires an action potential, it triggers a series of events, leading to a twitch contraction in the muscle fibers. The process of excitation-contraction coupling is crucial in relaying the action potential to the muscle fibers.
The latent period of contraction marks the onset of excitation-contraction coupling, when the action potential propagates across the sarcolemma, preparing the muscle fibers for contraction. As the fibers enter the contraction phase, the...

Hierarchy of Motor Control

Hierarchy of Motor Control

The hierarchy of motor control refers to the different levels of organization and processing involved in controlling movement in the body. These levels range from higher cortical areas involved in planning and decision-making to lower spinal cord reflexes that respond automatically to external stimuli.

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Updated: Feb 3, 2026

Formation of Ordered Biomolecular Structures by the Self-assembly of Short Peptides

Formation of Ordered Biomolecular Structures by the Self-assembly of Short Peptides

Published on: November 21, 2013

Engineering with Biomolecular Motors.

Henry Hess¹, Gadiel Saper¹

¹Department of Biomedical Engineering , Columbia University , New York , New York 10027 , United States.

Accounts of Chemical Research

|October 31, 2018

Summary

This summary is machine-generated.

Biomolecular motors offer efficient, sustainable power for hybrid nanosystems, demonstrating key engineering principles. Their high energy efficiency and longevity offer insights for future nanotechnologies.

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Area of Science:

Nanotechnology and Nanosystems Engineering
Biophysics and Molecular Biology
Materials Science

Background:

Biomolecular motors, like kinesin, are adaptable components for hybrid nanosystems.
Integrating biological and synthetic elements advances active nanosystem design.
Understanding motor proteins informs nanoscale engineering and evolutionary principles.

Purpose of the Study:

To holistically understand engineering principles for systems integrating molecular motors.
To explore biomolecular motor-powered nanodevices for sensing, computation, and actuation.
To identify key metrics like energy efficiency and system lifetime in synthetic motor design.

Main Methods:

Design and fabrication of biomolecular motor-powered nanodevices.
Analysis of energy conversion efficiency using ecological principles analogy.
Investigation of motor and system lifetime as critical performance metrics.

Main Results:

Biomolecular motors exhibit energy conversion efficiencies exceeding 10%, surpassing synthetic counterparts.
Nanodevices demonstrate sensing, computing, and actuating capabilities, mimicking biological solutions.
The study highlights the relationship between energy conversion, work extraction, and information production.

Conclusions:

Biomolecular motors provide a model for efficient and sustainable nanoscale energy conversion.
Future molecular motors may need to adopt biomolecular characteristics (softness, fragility).
Progress in biotechnology and drug development will drive the commercial viability of biomolecular motor engines.