If the accumulation of graded potentials in the trigger zone reaches threshold, the result is:

voltage-gated channels open

Explanation:

i disagree that there is little difference between adult female development and adult male development. sociological studies comparing female and male pathways to adulthood, revelead that there are sustancial differences between them. particularly, female and male differ from timing of marriage, when they began to live with children and the likelihood of combining wife/husband and parent roles.

the telephone is the answer