When an Impulse Arrives at the Synaptic End Bulb,the Membrane

question 4

Short Answer

When an impulse arrives at the synaptic end bulb,the membrane becomes more permeable to [dropdown 1].The ion movement into the synaptic end bulbs causes [dropdown 2] of [dropdown 3] into the synaptic cleft.
Dropdown 1 choices:
calcium
chloride
potassium
sodium
Dropdown 2 choices:
endocytosis
exocytosis
Dropdown 3 choices:
electrons
ions
neurotransmitters
protons

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Definitions:

Within

Inside or not further than a certain area, time period, or range.

Endo-

A prefix meaning "inside," "within," or "internal."

-cidal

A suffix indicating a substance or agent that kills or destroys a specified type of organism, such as bactericidal, which kills bacteria.

Killing

The act of causing death deliberately or due to negligence.