Electromyography

Question 1

EMG

Answer 1

electromyography - recording of the action potentials occurring in skeletal muscle fibres

Question 2

extracellular recodring of emg

Answer 2

both electrodes outside the muscle fibres. record the emf (potential) between 2 locations both outside the cells

Question 3

ECG

Answer 3

electrocardiogram. electrodes on limbs or chest, recording action potentials from the heart

Question 4

EEG

Answer 4

electroencephalogram - recording action potentials from the brain. electrodes on the scalp

Question 5

intracellular recording

Answer 5

one elctrode inside the cell - measure mef between inside (more negative) and outside cell

Question 6

extracellular recording

Answer 6

both electrodes outside the muscle fibre - measure emf between 2 sites outside the fibres. At rest: no difference. Activating an action potential at one electrode will create a charge difference between the electrodes. It will reach the other electrode and will be equal in magnitude but opposite sign.

Question 7

tetanus

Answer 7

involuntary contraction due to electricity passing through