When asked to explain the hormone regulation process directed by circadian rhythms, the nurse provides the example of:
1. The release of cortisol to peak in the early morning.
2. The regulation of the female menstrual cycle.
3. The stimulation of insulin production by an increased level of glucose.
4. The increased production of luteinizing hormone (LH) during the menstrual cycle.
The release of cortisol to peak in the early morning.
Rationale: An example of circadian rhythms regulation is the release of cortisol, whose peaks and troughs vary during a 24-hour period. Infradian rhythms are those that last for more than 24 hours. This is seen in the female menstrual cycle. The increased production of insulin as stimulated by the brain's perception of increased serum glucose is an example of the neural regulatory process. Feedback systems can be positive or negative. An example of positive feedback is the release of leuteinizing hormone in response to higher estrogen levels.
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