Which of the following is NOT true of graded potentials? (A) their size varies with the strength of the stimulus.
(B) one graded potential can add to another graded potential during
summation
(C) they can be a depolarization or hyper-polarization,
(D) the graded potential can propagate over long distances.

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.

Many archeologists and anthropologists disagree with dr. thorne's view.  thorne strongly believes that what many calls "homo erectus"  was in fact  homo sapiens,  and that they migrated out of africa almost 2 million years ago and dispersed throughout europe and asia. that's way different  from what scientists have always believed about the evolution of the species.