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Electromyography and Muscle Signals

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Questions and Answers

Which part of a muscle is responsible for initiating muscle action?

Muscle fibers

Axon (correct)

Motor end plates

Neuromuscular junction

What is the purpose of an Electromyogram (EMG) examination?

To measure single motor unit activity

To measure the electrical activity from several muscle fibers (correct)

To connect the brain and spinal cord to muscle fibers

To record the electrical signals from many motor units

What type of electrode is used to measure the electrical signals from many motor units?

Insulated electrode

Microelectrode

Surface electrode (correct)

Concentric needle electrode

What is a motor unit composed of?

Branch of neuron Signup and view all the answers

What is the purpose of a concentric needle electrode in an EMG examination?

To measure single motor unit activity Signup and view all the answers

Which nerves can be electrically stimulated to study the reflex system?

Both sensory and motor nerves Signup and view all the answers

What is the latency period in the context of EMG?

The time between stimulation and the beginning of the response Signup and view all the answers

What happens at low stimulating levels in terms of sensory and motor nerves?

Only sensory nerves are activated Signup and view all the answers

What generates the reflex response that travels along the motor nerves?

The action potential of the sensory nerves Signup and view all the answers

What is the purpose of studying the response of sensory and motor nerves to different stimulus strengths?

To study the reflex system Signup and view all the answers