Which process directs the 24-hour cycle?

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Multiple Choice

Which process directs the 24-hour cycle?

The 24-hour cycle is driven by the circadian timing system, an internal clock that generates daily rhythms and is coordinated by the circadian process. This clock resides mainly in the suprachiasmatic nucleus and is entrained by light-dark cues, aligning wakefulness, body temperature, hormones, and other functions with day and night. Sleep homeostasis, the other process, tracks how long you’ve been awake and builds sleep pressure that promotes sleep, but it does not set the length of the 24-hour cycle. It modulates when you feel sleepy within the cycle, not the cycle’s timing itself. So the circadian process governs the 24-hour rhythm, not None and not both.

The 24-hour cycle is driven by the circadian timing system, an internal clock that generates daily rhythms and is coordinated by the circadian process. This clock resides mainly in the suprachiasmatic nucleus and is entrained by light-dark cues, aligning wakefulness, body temperature, hormones, and other functions with day and night. Sleep homeostasis, the other process, tracks how long you’ve been awake and builds sleep pressure that promotes sleep, but it does not set the length of the 24-hour cycle. It modulates when you feel sleepy within the cycle, not the cycle’s timing itself. So the circadian process governs the 24-hour rhythm, not None and not both.

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