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muscle fibre

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extrafusal fibre

extrafusal fibre  

A typical contractile muscle cell or muscle fibre that lies outside muscle spindles.
fast-twitch fibre

fast-twitch fibre  

A striped muscle fibre that responds quickly and powerfully but is more prone to fatigue than slow-twitch fibre. US fast-twitch fiber. See fast glycolytic fibre, fast oxidative glycolytic fibre.
fibre

fibre  

1 The indigestible part of plants consisting of non-starch, structural polysaccharides including cellulose, hemicellulose, gums, pectin, and lignin. Nutritionists divide fibre into two main types: ...
motor neuron

motor neuron  

Reference type:
Overview Page
A neuron that transmits nerve impulses from the central nervous system to an effector organ (such as a muscle or gland) and thereby initiates a physiological response (e.g. muscle contraction).
muscle fibre

muscle fibre   Quick reference

The Oxford Dictionary of Sports Science & Medicine (3 ed.)

Reference type:
Subject Reference
Current Version:
2007
Subject:
Science and technology, Medicine and health
Length:
210 words
Illustration(s):
1
In skeletal muscle, a single, multinucleated cell which appears banded or striated when viewed under a light microscope. A single muscle contains between 10 000 and 450 000 fibres. Each ... More
myofibril

myofibril  

Reference type:
Overview Page
n. one of numerous contractile filaments found within the cytoplasm of striated muscle cells. When viewed under a microscope myofibrils show alternating bands of high and low refractive index, which ...
oxidative capacity

oxidative capacity  

A measure of a muscle's maximal capacity to use oxygen in microlitres of oxygen consumed per gram of muscle per hour. Factors which affect the oxidative capacity of muscles include the activity of ...
recruitment

recruitment  

The enlistment of different numbers and types of muscle fibre during the contraction of a whole muscle. Recruitment follows a set pattern: slow-twitch fibres are brought into action first, then fast ...
sarcolemma

sarcolemma  

The contractile membrane that surrounds a muscle fibre. See also transverse tubules.
sarcoplasmic reticulum

sarcoplasmic reticulum  

An arrangement of membranous vesicles and tubules found in the cytoplasm of striated muscle fibres. The sarcoplasmic reticulum plays an important role in the transmission of nervous excitation to the ...
transverse tubules

transverse tubules  

A series of infoldings of the plasma membrane (sarcolemma) of muscle fibres that envelop each myofibril at the Z line (see sarcomere). The T tubules transfer action potentials from the sarcolemma to ...
triad vesicle

triad vesicle  

A sac in a muscle fibre that contains cellular secretions, such as calcium ions, needed to initiate muscle contraction.
z-line

z-line  

In striated muscle, one of the regularly spaced lines that bisect the I-bands and divide the myofibrils into sarcomeres.

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