Internally generated cycles lasting about 24 hours a day that regulate sleep and wake cycles, as well as hormone secretion, are called
A. sleep disorders.
B. circadian rhythms.
C. REM periods.
D. astral projections.
Answer:B
Internally generated cycles lasting about 24 hours a day that regulate sleep and wake cycles, as well as hormone secretion, are called
A. sleep disorders. B. circadian rhythms. C. REM periods. D. astral projections.