Endogenous: A circadian rhythm comes full cycle every 24 hours. It is endogenous but believed by many to be influenced by the position of the moon to the earth.
Answered 5/27/2013
5.2k views
3 doctors weighed in across 2 answers
6 doctors weighed in across 2 answers
A doctor has provided 1 answer
A doctor has provided 1 answer
90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more.
Ask your question