Question

The contraction of the skeletal muscles results in the generation of action potential in the individual muscle fibers. Record of this action potential is called ______________

(a) ECG

(b) EMG

(c) EEG

(d) EKG

I have been asked this question in an interview for internship.

My doubt stems from Electrodes for EMG topic in portion Bioelectric Signal and Electrodes of Biomedical Instrumentation

Answer 1

Right choice is (b) EMG

Easiest explanation: The contraction of the skeletal muscles results in the generation of action potential in the individual muscle fibers, a record of such action potential is known as electromyogram (EMG). The activity is similar to that observed in the cardiac muscles (ECG or EKG), but in the skeletal muscles, repolarization takes place much more rapidly. The action potential lasts for only few milliseconds.