Physiology: The All or None Rule in Muscle Fibers

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Questions and Answers

What is the minimum requirement for a stimulus to produce a response?

  • The stimulus must be supramaximal
  • The stimulus must be above the threshold (correct)
  • The stimulus must be sub-threshold
  • The stimulus must be suprathreshold

What does chronaxie represent in the strength-duration curve?

  • The duration of the stimulus needed to excite
  • The maximum current required to stimulate
  • The intensity of the stimulus that produces a response (correct)
  • The minimum time required to stimulate

Which of the following statements is true about the strength-duration curve?

  • A stronger stimulus is not required to excite the nerve (correct)
  • The weaker the stimulus, the shorter the time needed
  • The stronger the stimulus, the longer the time needed
  • There is a direct relationship between strength and duration of the stimulus

Why are electrical stimuli commonly used in laboratories?

<p>Their intensity, duration, and site of application can be easily controlled (C)</p> Signup and view all the answers

Which of the following tissues has a shorter chronaxie value?

<p>Muscle fiber (C)</p> Signup and view all the answers

What is the term for the minimum current required to stimulate a nerve?

<p>Rheobase (A)</p> Signup and view all the answers

What is the relationship between the strength and duration of the stimulus?

<p>There is an inverse relationship between strength and duration (C)</p> Signup and view all the answers

What is the term for the time required for a stimulus to excite a nerve?

<p>Utilization time (A)</p> Signup and view all the answers

Which of the following statements is true about the excitability of different tissues?

<p>Cardiac muscle is more excitable than nerve (D)</p> Signup and view all the answers

What is the all-or-none rule in electrical stimulation?

<p>A stimulus either produces a full response or no response at all (B)</p> Signup and view all the answers

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