When an Action Potential from a Motor Neuron Arrives at the Neuromuscular

question 23

Multiple Choice

When an action potential from a motor neuron arrives at the neuromuscular junction (NMJ) , a series of events occurs that leads to muscle contraction. Which of the following events will occur last (that is, after all of the others) ?

• A) acetylcholine (ACh) release
• B) action potential propagation down the T tubules
• C) conformational change in troponin
• D) depolarization of the muscle cell
• E) release of Ca2+ from the sarcoplasmic reticulum

---

Definitions:

Taxes

Financial charges imposed by governments on individuals, businesses, or other entities, primarily to fund public expenditures.

Labor

Work performed by people that contributes to the production of goods and services in an economy.

Marginal Tax Rate

The rate at which the last dollar of income is taxed, indicating the percentage of additional income that is taken as tax.

Worker

An individual engaged in some form of productive labor, either as an employee, contractor, or self-employed person, contributing to the production of goods and services.