The "runner's high" and the euphoria sometimes associated with childbirth, painful initiation rites, and sports parachuting are due to the release of

a. acetylcholine.
b. endorphins.
c. neurilemma.
d. epinephrine.


B

Psychology

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All of an embryo's major organs and body parts have formed by about how many weeks after conception?

A) 4 B) 8 C) 16 D) 32

Psychology

Overall, the relationship between attitudes and behavior is ________

A) based on personality attributes B) reliable, with some exceptions C) almost non-existent D) based on gender E) only found in contrived experiments

Psychology

Genes involved in __________ and __________ signaling are associated with human aggression.

A. serotonin; dopamine B. acetylcholine; epinephrine C. serotonin; epinephrine D. acetylcholine; dopamine

Psychology

Most vivid dreams occur during __________.

Fill in the blank(s) with the appropriate word.

Psychology