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Quiz

L25 Skeletal Muscle Structure and Function

Mer Scott 12 perguntas 5,0 (1 avaliação)

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Perguntas do quiz (12)

  1. 1Skeletal muscle is essential for movement, posture, and heat generation.
    1. AVerdadeiro
    2. BFalso
  2. 2A muscle cell is made of myofilaments, and the sarcomeres within it are made of myofibrils.
    1. AVerdadeiro
    2. BFalso
  3. 3Myofibrils have around 30,000 sarcomeres.
    1. AVerdadeiro
    2. BFalso
  4. 4[blank_start]Sarcoplasmic Reticulum[blank_end]: The ER of the muscle. Stores calcium.
    [blank_start]T-tubule(Transverse tubule)[blank_end]: invaginated sarcolemma, enhances calcium transport.
    [blank_start]Triad[blank_end]: T-tubule in between two SR.
    1. ASarcoplasmic Reticulum
    2. BT-tubule(Transverse tubule)
    3. CTriad
    4. DT-tubule(Transverse tubule)
    5. ETriad
    6. FSarcoplasmic Reticulum
    7. GTriad
    8. HSarcoplasmic Reticulum
    9. IT-tubule(Transverse tubule)
  5. 5Troponin and tropomyosin attach to myosin, making them part of the thick filament.
    1. AVerdadeiro
    2. BFalso
  6. 6If a motor neuron innervates a large number of muscle fibres, the action is precise.
    If a motor neuron innervates a small number of muscle fibres, the action is unprecise.
    1. AVerdadeiro
    2. BFalso
  7. 7Choose the correct statements.
    1. AA muscle fibre is innervated by multiple motor neurons.
    2. BA motor neuron always innervates only one muscle fibre.
    3. CThe more muscle fibres innervated by a neuron, the more precise the movement.
    4. DNone of these are correct.
  8. 8The mechanism of contraction of skeletal muscles begins with [blank_start]excitation[blank_end]. Here, the [blank_start]neuronal[blank_end] action potential is transferred to a [blank_start]muscular[blank_end] action potential via the neurotransmitter ACh. (This ACh is diffused through the NMJ when [blank_start]Ca++[blank_end] channels opening in the neuron trigger the release of vesicles.)
    Next, [blank_start]contraction[blank_end] occurs. ACh receptors open voltage gated [blank_start]Na+[blank_end] channels, which depolarises the muscle membrane ([blank_start]sarcolemma and T-tubules[blank_end]). Ca++ is released from the [blank_start]SR[blank_end] and diffuses into the firstly the [blank_start]sarcoplasm[blank_end], and then the [blank_start]myofilaments[blank_end]. Here it forms crossbridges with the myofilaments, allowing them to interdigiate.
    After, the muscle [blank_start]relaxes[blank_end] when Ca++ is taken up into the SR and the crossbridges [blank_start]uncouple[blank_end].
    1. Aexcitation
    2. Bneuronal
    3. Cmuscular
    4. DCa++
    5. Econtraction
    6. FNa+
    7. Gsarcolemma and T-tubules
    8. HSR
    9. Isarcoplasm
    10. Jmyofilaments
    11. Krelaxes
    12. Luncouple
  9. 9Choose the incorrect statement.
    1. AWhen Ca++ binds to the troponin-tropomyosin complex, it changes its composition, to open the binding site for myosin.
    2. BMyosin is in an energised state before Ca++ enters.
    3. CATP is released when the myosin moves in its power stroke.
    4. DMyosin binding to the open site on actin is the formation of the crossbridge.
  10. 10The sarcolemma depolarises when no new AP innervates it.
    1. AVerdadeiro
    2. BFalso

Informações

Descrição
• Understand why we need muscle (cardiac, smooth, skeletal). • Know the structure and molecular components of skeletal muscle and their interaction. • Know the structure and molecular components of motor unit (neuromuscular junction). • Understand the mechanism of contraction
Idioma
English
Visualizações
49
Avaliação
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