Fatigue

The muscle fibers along with their supplying motor neuron is known as:

• Motor nerve

• Descending drive

• Motor unit

• Neuromuscular junction

Which of the following is an outcome of peripheral fatigue?

• Reduced excitability of muscle fiber membrane

• The muscle reaches its maximal contraction capacity

• Descending drive from pre-motor cortex becomes strong and consistent

• Motor neurons become more responsive to excitatory input

At the beginning of a muscle contraction, we usually start by recruiting the larger muscle fiber:

• True

• False

The propagation of the muscular action potential along the muscle membrane triggers the release of which of the following from the sarcoplasmic reticulum:

• Acetylcholine

• Calcium ions

• Troponin

• None of the above

One of the following is a characteristic of an EMG signal of a fatigued muscle:

• Consistent high frequency and amplitude

• Variable low frequency and high amplitude