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Home Q & A Board Biology-Related Homework Help General Biology
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LesleyCher LesleyCher
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6 years ago
Sensory nerves communicate the strength of a stimulus by
 
  a. the magnitude of the voltage change across the membrane during the action potential.
  b. the speed at which the action potentials are transmitted down the axon.
  c. the number of action potentials transmitted down the axon.
  d. a and b.
  e. a and c.

Question 2

A nerve cell returns to the resting potential as ______ ions leave the cell.
 
  a. sodium
  b. potassium
  c. calcium
  d. chloride
  e. ammonium
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#1
6 years ago
Answer to q. 1

C; Action potentials are of constant magnitude and travel at constant speed (choices a and b). The number of potentials, coupled with the number of neurons sending potentials, communicates the strength of a stimulus.

Answer to q. 2

B; The diffusion of potassium during the second part of the action potential takes place as potassium leaves the cell. The loss of positively charged ions helps to reestablish the resting potential, which is negative inside relative to outside the cell.
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