When endogenous rhythms are studied by removing all external time cues,what duration of circadian rhythm do most people adopt?
A)approximately 23-24 hours long
B)approximately 24-25 hours long
C)approximately 25-26 hours long
D)Humans are unable to maintain a normal circadian rhythm when external cues are removed.

Question

Quizplus · Accepted Answer

Most people adopt a circadian rhythm that is slightly longer than 24 hours, approximately 24-25 hours long, when all external time cues are removed. This has been demonstrated in various studies where individuals were placed in environments without natural light or time indicators, showing that the internal biological clock tends to run on a cycle slightly longer than the 24-hour day.

When Endogenous Rhythms Are Studied by Removing All External Time