structure of a striated muscle

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Last updated 3:12 PM on 3/31/26
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17 Terms

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striated muscles

muscles in the body attached to the skeleton…made up of muscle fibres

<p>muscles in the body attached to the skeleton…made up of muscle fibres </p>
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muscle fibres

contains contractile proteins in the cytoplasm…cell surface membrane and many nuclei

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sarcolemma

cell surface membrane

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sarcoplasm

cytoplasm

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sarcoplasmic reticulum

endoplasmic reticulum

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T tubules

run close to the sarcoplasmic reticulum…sarcolemma’s deep tube like projections

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sarcoplasm adaptations

mitochondria for ATP for muscle contraction…myofibrils for muscle contraction

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myofibrils

bundles of actin and myosin which slide past each other during contraction

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sarcoplasmic reticulum adaptations

calcium proton pumps to transport calcium ions into the SR lumen

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myosin

thick filaments

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actin

thin filaments

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H band

only thick myosin filaments

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I band

only thin actin filaments

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A band

areas where only myosin is present and areas where myosin and actin overlap

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M line

attachment for myosin filaments

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Z line

attachment for actin filaments

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sarcomere

section of myofibril between 2 Z lines