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PTH, secreted by the parathyroid gland, increases calcium levels in the blood by promoting calcium absorption from bones and intestines.
Ref: NCERT Class 11 Biology Chapter 19: Chemical Coordination and Integration Pineal Gland and Thyroid Gland
Melatonin, secreted by the pineal gland, regulates the circadian rhythm, including sleep-wake cycles.
Ref: NCERT Class 11 Biology Chapter 19: Chemical Coordination and Integration Pineal Gland and Thyroid Gland
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