In the synaptic cleft, three nursing students discussed what would have to be absent to prevent the action potential from moving from the pre-synaptic membrane to the post-synaptic membrane:

1) Debra suggested that Ca++ would have to be missing to prevent the action potential from moving from the pre-synaptic membrane to the post-synaptic membrane.

2) Larry stated that Ca++ would have to be missing because it is the neurotransmitter that takes the messages from the pre-synaptic membrane to the post-synaptic membrane.

3) Timothy thought that the secretory vesicles would have to be absent to prevent the
action potential from moving from the pre-synaptic membrane to the post-synaptic
membrane since it contains the neurotransmitter responsible for taking the message
from one membrane to the next.

(HELP NEEDED ASAP. THANK U SO MUCH)