Muscle Physiology Quiz
3 years ago
adammillikan
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16 QuestionsShow answers
  • Question 1
    120 seconds
    Q. The segment of a myofibril that is called a sarcomere runs from _______________.
    answer choices
    one Z line to the next Z line
    one H zone to the next H zone
    one A band to the next A band
    one end of a skeletal muscle to the opposite end
  • Question 2
    180 seconds
    Q. Into what does the neuron release its neurotransmitter at the neuromuscular junction?
    answer choices
    motor end plate
    cytoplasm of the muscle cell
    terminal cisternae
    synapse
  • Question 3
    180 seconds
    Q. A motor unit is made up of _______________.
    answer choices
    all the muscle fibers within a given muscle
    a motor neuron and the muscle fibers it innervates
    all the neurons going into an individual section of the body
    a fascicle and a nerve
  • Question 4
    180 seconds
    Q. The crossbridges involved in muscle contraction are located on the ________________.
    answer choices
    myosin filaments
    actin filaments
    tropomyosin 
    troponin
  • Question 5
    180 seconds
    Q. Which of these statements is correct regarding muscle contraction?
    answer choices
    All motor units act together
    Muscle contraction continues for long periods after nervous stimulation ceases
    The crossbridges bind to the actin and shorten the sarcomeres
    Troponin is not needed to strengthen the contracting muscle cell.
  • Question 6
    180 seconds
    Q. Which of the following is a component of a thin filament?
    answer choices
    actin
    myosin
    troponin
    tropomyosin
  • Question 7
    180 seconds
    Q. Which of the following statements concerning the role of Ca2+ in the contraction of skeletal muscle is correct?
    answer choices
    The mitochondria act as a store of Ca2+ for the contractile process
    Ca2+ entry across the plasma membrane is important in sustaining the contraction of skeletal muscle
    A rise in intracellular Ca2+allows myosin to interact with actin
    The tension of a skeletal muscle fibre is partly regulated by G proteins.
  • Question 8
    180 seconds
    Q. The functional unit of the contractile system in skeletal muscle is(are) 
    answer choices
    myofibrils
    cross-bridges
    sarcomeres
    Z-bands
  • Question 9
    180 seconds
    Q. Muscle fatigue sets in due to the nonavailability of 
    answer choices
    calcium
    ATP
    actin binding sites
    sodium
  • Question 10
    180 seconds
    Q. Which of the following sets of ions are necessary in the chemical events of muscle contraction?
    answer choices
    sodium and potassium
    iron and magnesium
    sodium and calcium
    sodium and magnesium
  • Question 11
    180 seconds
    Q. The neurotransmitter always used at the neuromuscular junction is: 
    answer choices
    epinephrine
    noradrenaline
    acetylcholine
    dopamine
  • Question 12
    180 seconds
    Q. Which of the following steps occurs first?
    answer choices
    myosin heads attach to actin
    myosin heads pivot pulling the actin filament toward the center
    cross-bridges detach from actin when a new ATP binds to myosin
    another cross-bridge forms
  • Question 13
    180 seconds
    Q. Which of the following occurs when a muscle contracts?
    answer choices
    the distance between z-lines remains the same
    the H-zone disappears
    the muscle strengthens 
    the distance between z-lines decreases
  • Question 14
    180 seconds
    Q. Is skeletal muscle control considered voluntary or involuntary?
    answer choices
    Voluntary
    Involuntary
  • Question 15
    180 seconds
    Q. As I'm hiking through the woods, I come across a bear. Which nervous system will be firing inside my body?
    answer choices
    Sympathetic
    Parasympathetic 
    Somatic
    Autonomic
  • Question 16
    180 seconds
    Q. The thick filament is called what?
    answer choices
    Actin
    Sarcomere
    Sarcolemma
    Myosin
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