During the luteal phase of the menstrual cycle, progesterone from the corpus luteum has multiple effects. Its thermogenic effect (raising basal body temperature by 0.3-0.5°C) is mediated by:
- A Progesterone acting on the hypothalamic thermoregulatory center, resetting the thermal setpoint upward likely via interaction with the thermosensory system ✓
- B Progesterone stimulating increased thyroid hormone secretion via TSH-independent mechanisms
- C Progesterone uncoupling oxidative phosphorylation in brown adipose tissue like thyroid hormone
- D Progesterone increasing BMR by stimulating Na+/K+-ATPase activity in all tissues uniformly
Explanation
Progesterone's thermogenic effect is centrally mediated through actions on the preoptic area and anterior hypothalamus, which is the primary thermoregulatory center. The exact molecular mechanism is still under investigation, but it appears to involve upward resetting of the thermal setpoint, possibly via interaction with hypothalamic neurons that express progesterone receptors and project to thermogenic pathways. This property is the physiological basis for basal body temperature (BBT) charting as a method of confirming ovulation — the sustained temperature rise in the luteal phase indicates post-ovulatory progesterone secretion.
Reference: Guyton & Hall, Textbook of Medical Physiology, 14th ed.
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