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Muscle Structure

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Muscle structure revision flashcards. OCR A: A level biology revision notes. Module 5: Communication, Homeostasis and Energy. A* biology student's notes. Summary of key content to be memorised. Process that needs to be memorised from specification.

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  • December 5, 2023
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  • 2023/2024
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flcarr23
Type of Skeletal Cardiac Smooth
Muscle
Fibre Striated. Specialised Non-striated.
Appearance striated.
Controls Involuntary Involuntary (autonomic NS).
Voluntary (somatic (autonomic NS). Diameter of arteries/
NS). Contraction of arterioles/ bronchi/
Movement of heart bronchioles.
skeleton. (myogenic). Control of Peristalsis/ uterine
contractions/ pupil size.
Arrangement Cells branch and
Regular – muscle interconnect, No regular arrangements –
contracts in one resulting in different cells can contract in
direction. simultaneous different directions.
contraction.
Contraction Fast twitch: rapid. Intermediate Slow.
Speed Slow twitch: slow. (rhythmic).
Length of Fast twitch: short. Intermediate Relatively long.
Contraction Slow twitch: long. (rhythmic).
Structure Faint stripes on
Tubular, striated the fibres. Fibres
fibres with Fibres are spindle shaped and
are branched an uninucleated.
multinucleate uninucleated.
cells. Intercalated
discs present.
Found In Limbs & Bronchi/ bronchioles/
intercostal Walls of heart. arteries/ arterioles/
muscles. oesophagus/ gut.

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