Basic Care and Comfort NCLEX PN Questions Nursing Practice Question
The 24-hour day-night cycle is known as:
Correct Answer: A
Rationale: The circadian rhythm governs the 24-hour cycle of physiological processes. Infradian rhythms are longer than 24 hours (e.g., menstrual cycle), ultradian rhythms are shorter (e.g., sleep cycles), and non-REM rhythm is not a recognized term.