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Human placental lactogen (hPL) is secreted by the placenta and helps prepare the breasts for lactation by altering maternal metabolism.
Ref: NCERT Class 12 Biology Chapter 2: Human Reproduction Menstrual Cycle Fertilization Implantation Pregnancy Parturition Lactation
During pregnancy, the placenta secretes progesterone, which helps maintain the uterine lining and prevent contractions.
Ref: NCERT Class 11 Biology Chapter 19: Chemical Coordination and Integration Mechanism of Hormone Action - Second Messengers
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