Question

increasing excitatory signals above the threshold for neural activation will not affect the intensity of an action potential. this indicates that a neurons reaction is

• 2 points

o primarily electrical rather than chemical
o an all - or - nothing response
o inhibited by the myelin sheath
o dependent on neurotransmitter molecules

reuptake refers to the *
2 points
o movement of neurotransmitter molecules across a synaptic gap
o reabsorption of excess neurotransmitter molecules by a sending neuron
o the ending of refractory period
o inflow of positively charged ions through an axon membrane

Explanation:

For the first question, the all - or - nothing law of neurons states that once the threshold for neural activation is reached, further increasing excitatory signals does not affect the intensity of the action potential. For the second question, reuptake is the process by which a sending neuron reabsorbs excess neurotransmitter molecules.

Answer:

1. B. an all - or - nothing response
2. B. reabsorption of excess neurotransmitter molecules by a sending neuron