One physiological 'marker' of the human circadian rhythm is core body temperature; the nadir occurs around 4 AM and a peak around 6 PM. This statement is:

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Multiple Choice

One physiological 'marker' of the human circadian rhythm is core body temperature; the nadir occurs around 4 AM and a peak around 6 PM. This statement is:

Core body temperature follows a daily circadian rhythm, dipping to its lowest point in the early morning and rising to a daily high in the late afternoon to early evening. A nadir around 4 AM and a peak around 6 PM fits the typical pattern seen in adults, reflecting the synchronization of body processes with the sleep–wake cycle and light exposure. The clock in the brain (the suprachiasmatic nucleus) coordinates this with hormonal signals and activity levels, producing a modest but noticeable temperature cycle of roughly half to one degree Celsius. Individual variation exists, but the described timing aligns with the common circadian temperature pattern, so this statement is true.

Core body temperature follows a daily circadian rhythm, dipping to its lowest point in the early morning and rising to a daily high in the late afternoon to early evening. A nadir around 4 AM and a peak around 6 PM fits the typical pattern seen in adults, reflecting the synchronization of body processes with the sleep–wake cycle and light exposure. The clock in the brain (the suprachiasmatic nucleus) coordinates this with hormonal signals and activity levels, producing a modest but noticeable temperature cycle of roughly half to one degree Celsius. Individual variation exists, but the described timing aligns with the common circadian temperature pattern, so this statement is true.

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