Examlex
The greatest proportionate influx of immigrants in the history of the United States came in the 1820s.
Serotonin
A neurotransmitter involved in regulating mood, appetite, sleep, memory, and learning. Imbalances in serotonin are associated with depression and other mood disorders.
Endorphins
Natural, pain-killing chemicals released in the brain that also contribute to sensations of pleasure or well-being.
Enkaphalins
Peptides found in the brain, acting as neurotransmitters or neuromodulators, involved in regulating pain and emotion.
Neurons
Neurons are the basic working units of the brain and nervous system, specialized cells designed to transmit information to other nerve cells, muscle, or gland cells through electrical and chemical signals.
Q5: The naval battle on Lake Erie resulted
Q7: John Marshall<br>A)the oldest member of the Constitutional
Q11: Joseph Smith<br>A)set up Seneca Falls Convention<br>B)founder of
Q28: The Webster-Hayne debate is best remembered for:<br>A)its
Q32: The Seneca Falls Convention:<br>A)celebrated the cult of
Q43: Mother Ann Lee was:<br>A)a "free love" advocate.<br>B)an
Q52: As royal governor of the Dominion of
Q55: William Wirt<br>A)offered as a toast at a
Q58: Paul Revere<br>A)was a British general in the
Q61: The first conflicts of the American Revolution