Why is type ab blood considered the universal recipient? it has both antibodies in the plasma. it has no antibodies in the plasma. it has no antigens on the red blood cells?

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.