Question

Questions 7-10 Before After option Plot x EPP size (mv) >Chd EPP size (mv) 5 mEPP size (mV) Question 7: What does the left-most column in plot x indicate? (see arrow in plot x above) The number of times more than one synaptic vesicle was released when the presynaptic nerve was stimulated b.The number of times no vesicle was released, even though the presynaptic nerve was stimulated The number of times the muscle cell depolarized when the presynaptic nerve was stimulated The number of times a single vesicle was released when the presynaptic nerve was stimulated Question& Which quantal analysis term is used to indicate what is counted in order to get the values in that left most column in plot x (see arrow in plot x above)? Units b. Vesicles c. mEPPs d. Failures Question 9: The data for questions 7-10 were recorded from a muscle cell at one neuromuscular junction before left) and after (right) an experimental manipulation that changed the strength of this synapse. Based on what we discussed in class, which of the following could be a valid explanation for what caused this change in synaptic strength? Assume baly one thing changed to cause these results. a. A larger number of acetylcholine (ACh) molecules were released from the synaptic vesicles A smaller number of acetylcholine (ACh) molecules were released from the synaptic vesicles c.There was an increase in the number of postsynaptic ACh receptors There was a decrease in the number of postsymaptic ACh receptors- There was an increase in the number of synaptic vesicles released when the presynaptic neuron was stimulated There was a decrease in the number of synaptic vesicles released when the presynaptic neuron was stimulated Question 10: Which of the following variables is/are affected by the concentration of Ca in the solution around the neuromuscular junction in these experiments? There may be more than one correct answer, select all that apply. a. n C. None of the above is affected by concentration of Ca2

Answer 1

Answer:

Explanation:

P is affected by the concentration of calcium in the solution around the neuromuscular junction.

When n was calcium dependent, the apparent increase in n could be modeled by introducing new p release sites as Calcium was raised.

When n was calcium independent the expt. Data were fit by abruptly increasing p among as subset of initially low p sites as Calcium was raised.

The apparent calcium dependence of n can be accounted for by an abrupt increase in p at a subset of release site.