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

question 8

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 listed below) ?

• A) acetylcholine (ACh) release
• B) conformational change in troponin
• C) depolarisation of the muscle cell
• D) release of Ca²⁺ from the sarcoplasmic reticulum

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Definitions:

Neuroglial Cells

Specialized cells in the nervous system that provide support, protection, and nutrition to neurons, ensuring their proper function.

Myelin Sheath

A fatty layer that surrounds the axons of some nerve cells, providing electrical insulation and improving the speed of nerve impulse transmission.

Burst

A sudden break or rupture, typically referring to pipes, balloons, or vessels under pressure.

Electrical Signals

Pulses of electric current or electromagnetic fields that are used for communication between various parts of a system, especially within biological organisms and electronic devices.