Lab 6: EMG, Fatigue, & Muscle Microanatomy

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Last updated 1:12 PM on 3/30/26
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22 Terms

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Nuclei of muscle fiber

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Striations

alternate dark and light bands found on skeletal and cardiac muscle

<p>alternate dark and light bands found on skeletal and cardiac muscle</p>
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Sarcomere

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I band

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A band

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H zone (band)

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Z line

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M line

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Actin

thin filaments

<p>thin filaments</p>
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Myosin

thick filament

<p>thick filament</p>
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T-tubules

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Terminal cisternae

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Sarcoplasmic reticulum

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Myofibril

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Motor unit

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Isometric muscle contraction

develops tension without changing length

important in postural muscle function and antagonistic muscle joint stabilization

<p>develops tension without changing length</p><p>important in postural muscle function and antagonistic muscle joint stabilization</p>
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Isotonic muscle contraction

muscle changes in length with no change in tension

<p>muscle changes in length with no change in tension</p>
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Agonist muscle

The muscle primarily responsible for movement of a bone.

<p>The muscle primarily responsible for movement of a bone.</p>
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Antagonist muscle

The muscle opposite the agonist, which must relax and lengthen during contraction of the agonist.

<p>The muscle opposite the agonist, which must relax and lengthen during contraction of the agonist.</p>
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EMG

electromyogram

<p>electromyogram</p>
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Muscle fatigue

Inability of muscle to maintain its strength of contraction or tension; may be related to insufficient oxygen, depletion of glycogen, and/or lactic acid buildup

<p>Inability of muscle to maintain its strength of contraction or tension; may be related to insufficient oxygen, depletion of glycogen, and/or lactic acid buildup</p>
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Muscular contraction

the process in which a muscle becomes or is made shorter and tighter.

<p>the process in which a muscle becomes or is made shorter and tighter.</p>