Question 9 deals with the neurons diagrammed below Neuron A

Question 9 deals with the neurons diagrammed below. Neuron A Neuron IB Neuron A releases a neurotransmitter that binds to a ligand-gated channel on Neuron C that allows increased conductance of sodium * Neuron B releases a neurotransmitter that binds to a ligand-gated channel on Neuron C that allows increased conductance of potassium * At rest, Neuron A is firing at a frequency of 10/sec, Neuron B is firing at a frequency of 10/sec and Neuron C is firing at a frequency of 25/sec. Which of the following would likely lead to an increase in the firing rate of Neuron C? Neuron A increases its firing rate. Neuron A decreases its firing rate. Neuron B increases its firing rate, D.Neuron B decreases its firing rate. A or B A or C A or D F.

Solution

1. The potential difference across the plasma membrane of an animal cell at rest varies between -20mV and -200mV.

2. The K+ gradient always has a major influence on this potential, the gradient of other ions also have significant effect.

3. So option \'C\' neuron B increases its firing rate.