The potential differences generated by the heart muscle as it contracts and relaxes can be measured by placing electrodes on the surface of the body. What is the record of these electrical events correctly called?

An electrocardiogram

Limb lead II

An electrocardiograph

An EEG

An electrocardiogram An electrocardiogram (ECG) is produced by an electrocardiograph machine.

Electricity Author: rikazzz

A. Protons and electrons and they attract each other”.

B. Positive and negative and they attract each other”.

C. Anions and cations and they repel each other”.

D. Electrons and ions and they repel each other”.

A. Pressure differences created by ventricular contraction

B. The closing and opening of heart valves

C. The de- and repolarisation of the cells of the myocardium

D. Variation in the electrical properties of oxygenated blood and deoxygenated blood as it moves through the heart

A. It is made of thick copper wire so presents almost zero resistance.

B. A fuse is located on the earth wire which will “blow” if excessive current flows.

C. The earth wire is connected to the ground and to the metal case of the appliance.

D. The on/off switch is on the earth wire so that power can be turned off.

A. Cardiac-protected

B. Body-protected

C. Equipotentially earthed

D. Double insulated

A. Active wire oscillates between +240 V and −240 V, while neutral and earth are both at 0 V.

B. Neutral wire at −240 V, active at +240 V, earth at 0 V.

C. Active wire at +240 V, while neutral and earth are both at 0 V.

D. Neutral wire and active wire both at +240 V, earth at −240 V.

A. The electrical device receiving too high a current.

B. It protects the fuse or circuit breaker from too much current.

C. Electrocution of a person touching the faulty electrical device.

D. It protects against stray currents that may exist in the ground (the soil).

A. The fuse

B. The neutral wire

C. The metal casing

D. The on/off switch

Related posts