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Q23 - Ion Permeability and a Simple Reflex Circuit

Theoretical 2 Real exam question - full text reproduced under IBO's CC BY-NC-SA 4.0 license
Nervous System Physiology

The diagram below illustrates a neural pathway and the features of the associated neurotransmitters are described in the table. Ions concentrations inside and outside of the cells are same as their physiological normal values in body and inhibition of an inhibitory neuron results in the stimulation of postsynaptic neuron. “+” Symbol in table indicate the activation of the ion channels which increases the ion permeability across the membrane. Neurotransmitter Cl- Permeability Na+ Permeability K+ Permeability N1 (Na+) / N2 / N3 / N4 / N5

Figure 1. Figure 1.

Using the information and data, determine which of the statements are true or which are false.

A. The function of N1 neurotransmitter is same as acetylcholine.
B. Neuron G is not depolarized and neuron F is stimulated so muscle M1 contracts.
C. Neuron G gets depolarized as a result of Na ions influx.
D. Neuron F gets depolarized as a result of Cl ions efflux.
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Question reproduced from IBO 2018, Theoretical Paper 2, licensed under CC BY-NC-SA 4.0 - attributed to the International Biology Olympiad. Open the full exam PDF · Community solutions (unofficial)