Question

use the following information to answer questions 14 and 15. observations concerning a synapse i. electron micrographs of a synapse show no direct connection between the end of the axon of one neuron and the dendrites of the next neuron. ii. a synapse slows the transmission of the nerve impulse. iii. transmission across a synapse is always one - way: from the end of an axon to a dendrite. iv. successive transmission across a synapse brings about fatigue of synaptic transmission. v. stimulation of some neurons seems to inhibit the activation of the next neuron in the sequence. 14. the assumption that the end of the axon contains a limited amount of neurotransmitter substance accounts for observation a. ii b. iv c. i d. iii hint: questions are developed that require logical use of the concepts you study. does limited as a logic word help you? 15. the discovery that not all neurons release the same transmitter substance at a synapse accounts for observation a. ii b. iii c. iv d. v

Explanation:

1. For question 14: If the end - of the axon has a limited amount of neurotransmitter, repeated transmission (successive transmission) will deplete it, leading to fatigue of synaptic transmission. So observation IV is accounted for by the limited neurotransmitter assumption.
2. For question 15: Different neurotransmitter substances can have different effects. If some neurons release inhibitory neurotransmitters, it can inhibit the activation of the next neuron. So the fact that not all neurons release the same transmitter substance accounts for observation V.

Answer:

1. B. IV
2. D. V