Native Americans served in World War I even though they were not citizens of the United States. In fact, it was not until after World War II in the 1965 passage of the Voting Rights Act that all states were required to allow Native Americans to vote on the same basis as any other American.
Overview. Melatonin is a hormone secreted by the pineal gland in the brain. It helps regulate other hormones and maintains the body's circadian rhythm. The circadian rhythm is an internal 24-hour clock that plays a critical role in when we fall asleep and when we wake up. When it is dark, your body produces more melatonin.
Within the human body, melatonin is a hormone naturally secreted by the pineal gland of the brain. Its main function is to help regulate other hormones within the body and help to maintain the body's circadian rhythm, a sort of internal clock for the body.**.ithin the human body, melatonin is a hormone naturally secreted by the pineal gland of the brain. Its main function is to help regulate other hormones within the body and help to maintain the body's circadian rhythm, a sort of internal clock for the body.**.