Skeletal muscles

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    Created by
    Pierre Gasly

    Cards (45)

    • Which division of the nervous system controlls skeletal muscle
      The somatic motor neurons
    • How are bones connected to skeletal muscle
      Using tendons
    • What are tendons made of
      Collagen
    • What are the main functions of skeletal muscles
      Movement and maintenance of posture.
      Control of sphincters.
      Thermoregulation.
      Nutrients reserve.
    • Where does skeletal muscle sit in the skin
      Below the subcutaneous tissue
    • What is the epimysium made of
      Dense connective irregular tissue
    • Waht is the perimysium made of
      Dense connective irregular tissue
    • Label the skeletal muscle
      Muscle fibres are often referred to as myocytes.
      A) Bone
      B) tendon
      C) Epimysium
      D) Perimysium
      E) Fasicle
      F) Endomysium
      G) Muscle fiber
    • What is a bundle of myocytes called
      A fascicle it is wrapped in a perimysium
    • What is the role of the epimysium
      It covers the outside of the muscle
    • What is the role of the perimysium 

      It holds the fascicles.
    • What is the role of the endomysium
      It separates the individual myocytes.
    • How is a myocyte formed
      Myoblasts fuse in embryonic development.
    • What are the features of myocytes
      Multinucleated. The nuclei sit under the sarcolemma.
      Striated due to the alignment of the sacromeres.
    • What is the plasma membrane of a muscle fibre
      Sarcolemma
    • What are myofibrils
      They possess the contractile properties of a muscle fibre.
    • Waht are myofibrils made of.
      Myofilamets which can be thick or thin. These are arranged into sacromeres
    • Label this and state what it is
      This is a skeletal muscle fibre.
      A) Sacromere
      B) Mitochondria
      C) Motor neuron
      D) Synaptic terminal
      E) T tubule
      F) Sarcoplasmic reticulum
      G) Myofibril
      H) Sacrolemma
      I) Calcium
    • What is stored in the sarcoplasmic reticulum when relaxed
      Calcium
    • What are T-tubules
      The T stands for transverse. They transfer the action potential from the sarcolemma to the sarcoplasmic reticulum.
    • How is oxygen transported to the mitochondria of a muscle fibre
      Using myoglobin
    • What is the cytoplasm of a muscle fibre called
      The sarcoplasm
    • What is a sarcomere
      The arrangement of thick and thin myofilaments.
      It extends from one Z line to the next.
    • Label this and state what it is
      It is a myofibril.
      A) Sacromere
      B) A band
      C) Z line
      D) I band
      E) M Line
      F)
    • What is the M line
      It is in the middle of the sarcomere and attaches thick filaments together.
    • What is the A band
      Consits of thick and thin filaments
    • What is the I band
      Consists of only thin filaments
    • What is the H band
      Consists of only thick filaments
    • What is the Z line
      It is made of alpha actinin, which binds actin and titin to join the sarcomeres together.
    • What is the zone of overlap
      This is where the thick and thin fibres overlap
    • What happens to the sacromere during contraction
      The Z line shortens
    • What are thick filaments made of
      Myosin
    • What does the head of myosin do
      Binds to actin and hydrolyses ATP to ADP.
    • Where is titin found
      At the end of the thick filaments
    • What is the role of titin
      To prevent over-extension of the sarcomere
    • How do the myosin filaments work
      The myosin head moves [thick filaments] and pushes the actin [thin filaemnts] towards the M line.
    • What are the thin filamets made of
      Actin
    • What are the regulatory proteins in thin filaments
      Troponin and Tropomyosin.
    • What does nebulin do
      It anchors the thin filaments to the Z line
    • What does troponin do
      Regulates the position of tropomyosin
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