How are the signals detected and amplified by electrocardiograph?

The amplifier converts

Define : Signal

Galvanometer is used for detecting and measuring electric current.

The difference in the working of an amplifier and a step up transformer is

A change of 0.04 V takes place between the base and the emitter when an input signal is connected to the CE transistor amplifier. As a result, 20 muA change takes place in the base current and a change of 2 mA takes place in the collector current. Find the input resistance and A.C. current gain.

Hormones are called chemical signals that stimulate specific target tissues.Their specificity is due to the presence of signal receiving 'receptors' only in the respective target tissues. Where are these receptors present in case of hormones of protein nature ?

How does tongue detect the sensation of taste?

For what purpose common emitter transistor amplifier is preferred over common base transistor amplifier?

AC signal is preferred over DC signal because