Which of the Following Could Happen to the Neurotransmitter Once

Multiple Choice

Which of the following could happen to the neurotransmitter once it binds to the receiving membrane receptors?

A) reabsorbed by the sending membrane
B) absorbed by the receiving membrane in order to start the action potential
C) stays bound to the receiving membrane
D) released back into the synaptic cleft where it builds up
E) degrades due to lack of Ca⁺