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MMLU-Pro / 3403 / The muscle fibers innervated by a motor unit will contract if a stimulus of…

Problem

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question

The muscle fibers innervated by a motor unit will contract if a stimulus of sufficient magnitude is propagated or it will not contract at all. This is known as the all-or- none law. If this is true, how can muscle force be graded? For example, we use the same muscles to lift a one ounce object that we use to lift a 20 lb. object.

category

biology

options

  1. Muscle force is graded by the frequency of nerve impulses alone.
  2. Muscle force is graded by the weight of the object being lifted.
  3. Muscle force is graded by the amount of energy consumed.
  4. Muscle force is graded by altering the amount of blood flow to the muscle.
  5. Muscle force is graded by the duration of muscle fiber contraction.
  6. Muscle force is graded by the size of the muscle.
  7. Muscle force is graded by the type of muscle fiber being activated.
  8. Muscle force is graded by the number of motor units activated simultaneously.
  9. Muscle force can be graded through the process of recruitment and by varying the tension produced by individual fibers.
  10. Muscle force is graded by the length of the muscle at the start of contraction.

src

stemez-Biology

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Source and history

upstream_id / Original problem ID
3403
task_id
afa2183e-589b-5a57-aa67-a52ab8dde8d2
task_key
default--test--3403
task_revision_id
1
config / split
default / test

Official source

initial import