Automated external defibrillators (aeds) are used in cardiac arrest situations for:

Checks the heart rhythm and can send an electric shock to the heart to turn the rhythm back to normal. 

Iwould say silver and gold

Neurotransmitters are messengers responsible for communication between neurons. they are released from synaptic vesicles and are received by receptors.  the communication is referred to as neurotransmission. the following statement is true about neurotransmitters: a. they're stored in synaptic vesicles in the axon.