Solution:

Electrocardiography is the process of recording the electrical activity of the heart over a period of time using electrodes placed on the skin.

In medicine, a nebulizer or nebuliser (see spelling differences) is a drug delivery device used to administer medication in the form of a mist inhaled into the lungs. Nebulizers are commonly used for the treatment of cystic fibrosis, asthma, COPD and other respiratory diseases or disorders.

Electroencephalography (EEG) is an electrophysiological monitoring method to record the electrical activity of the brain. It is typically non invasive, with the electrodes placed along the scalp, although invasive electrodes are sometimes used such as in electrocorticography.

An endoscope is an illuminated optical, typically slender and tubular instrument (a type of borescope) used to look deep into the body and used in procedures called an endoscopy.