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Did you know?
The familiar sounds of your heart are made by the heart's valves as they open and close.
Did you know?
ACTH levels are normally highest in the early morning (between 6 and 8 A.M.) and lowest in the evening (between 6 and 11 P.M.). Therefore, a doctor who suspects abnormal levels looks for low ACTH in the morning and high ACTH in the evening.
Did you know?
Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.
Did you know?
The horizontal fraction bar was introduced by the Arabs.
Did you know?
In 1864, the first barbiturate (barbituric acid) was synthesized.