Which of these functions is NOT associated with the suprachiasmatic nucleus?

The suprachiasmatic nucleus (SCN) is primarily known for its integral role in regulating various circadian rhythms within the body. It is a cluster of neurons situated in the hypothalamus and serves as the central pacemaker for these rhythms.

Regarding sleep-wake cycles, the SCN receives direct input from retinal ganglion cells, allowing it to help synchronize these cycles with environmental light-dark changes. This function is vital for maintaining healthy sleep patterns and daily activities aligned with natural cycles.

The SCN also influences hormonal secretion, particularly the release of melatonin from the pineal gland, which is crucial for regulating sleep and responses to darkness. Additionally, it helps in the coordination of other circadian rhythms beyond just sleep, including feeding and various physiological processes.

While the SCN is involved in various homeostatic functions that may indirectly affect body temperature regulation (such as influencing metabolic rate), it is not primarily responsible for controlling body temperature directly. Body temperature regulation is managed by other areas of the hypothalamus, including the preoptic area. Therefore, the function not associated with the suprachiasmatic nucleus is the control of body temperature.