Aaron arrived at the hospital with the following symptoms: drooping eyelids; fatigue and weakness of his muscles; and difficulty talking, breathing, and swallowing. What was his diagnosis?
  • Myasthenia gravis
  • load on the fiber
  • 1st = true2nd = false
  • secreting hormones
Reduction in blood flow to a muscle fiber would have the greatest effect on ________.
  • fast and slow oxidative fibers
  • fast glycolytic fibers
  • load on the fiber
  • slow oxidative fibers
Which muscle type is responsible for this vasodilation?
  • smooth
  • smooth muscle
  • sarcoplasmic reticulum
  • secreting hormones
Duchenne muscular dystrophy could theoretically be cured if a technique was developed that would _________.
  • ACh is released by the motor neuron.
  • Calcium ions. Ca2+ binds to troponin, which removes tropomyosin from the myosin binding site on actin
  • Duchenne muscular dystrophy is caused by a mutation in the dystrophin gene. Without a normal copy of DNA for transcription, there can never be a normal protein translated. This genetic mutation causes the protein to be either abnormal in structure or completely absent.
  • direct phosphorylation of ADP by creatine phosphate
When a sarcomere contracts and thin filaments move over thick filaments you would expect to see ________.
  • the I bands to appear smaller
  • stress-relaxation response
  • fast and slow oxidative fibers
  • ACh is released by the motor neuron.
Which pathway for regenerating ATP is the most inefficient during 30 minutes of light to moderate exercise?
  • Calcium ions. Ca2+ binds to troponin, which removes tropomyosin from the myosin binding site on actin
  • ACh is released by the motor neuron.
  • certain smooth muscle cells can actually divide to increase their numbers
  • direct phosphorylation of ADP by creatine phosphate
Muscle tension remains relatively constant during isotonic contraction.
  • True
  • False
Which of the following is true about smooth muscle?
  • certain smooth muscle cells can actually divide to increase their numbers
  • Calcium ions. Ca2+ binds to troponin, which removes tropomyosin from the myosin binding site on actin
  • Skeletal muscle fibers contain sarcomeres; smooth muscle fibers do not.
  • secreting hormones
Which of the following is most directly required to initiate the coupling of myosin to actin?
  • Skeletal muscle fibers contain sarcomeres; smooth muscle fibers do not.
  • certain smooth muscle cells can actually divide to increase their numbers
  • load on the fiber
  • Calcium ions. Ca2+ binds to troponin, which removes tropomyosin from the myosin binding site on actin
Myasthenia gravis is sometimes treated medically by a treatment that involves _______
  • there are more thick filaments than thin filaments
  • ACh is released by the motor neuron.
  • the I bands to appear smaller
  • inhibiting the action of acetylcholinesterase
One action potential in a motor neuron causes the full reaction in skeletal muscle, which is called a twitch. One twitch can generate max tension in a muscle. Are these statements true or false?
  • Myasthenia gravis
  • fast glycolytic fibers
  • 1st = true2nd = false
  • slow oxidative fibers
What feature of smooth muscle allows it to stretch without immediately resulting in a strong contraction?
  • ACh is released by the motor neuron.
  • the I bands to appear smaller
  • break down acetylcholine
  • stress-relaxation response
When a muscle is unable to respond to stimuli temporarily, it is in which of the following periods?
  • load on the fiber
  • molecule
  • secreting hormones
  • refractory period
Which muscle cells have the greatest ability to regenerate?
  • secreting hormones
  • smooth muscle
  • certain smooth muscle cells can actually divide to increase their numbers
  • smooth
Which of the following is a factor that affects the velocity and duration of musclecontraction?
  • Calcium ions. Ca2+ binds to troponin, which removes tropomyosin from the myosin binding site on actin
  • secreting hormones
  • slow oxidative fibers
  • load on the fiber
Identify the correct sequence of the following events. (a) Myosin generates a power stroke. (b) Ca+ binds to troponin. (c) ATP recharges the myosin head. (d) Troponin removes tropomyosin from G actin. (e) The sarcomere shortens. (f) Myosin binds to actin.
  • load on the fiber
  • bdfaec
  • False
  • smooth
Addition of more myoglobin to a muscle fiber would have the largest effect on ________.
  • the I bands to appear smaller
  • fast and slow oxidative fibers
  • fast glycolytic fibers
  • slow oxidative fibers
What level of structural organization do voltage-gated sodium channels in muscle sarcolemma represent?
  • fast glycolytic fibers
  • False
  • molecule
  • stress-relaxation response
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