After successful implantation, what maintains the uterine lining by direct hormonal action?

💡 Explanation

The corpus luteum secretes progesterone, which is essential for maintaining the uterine lining during early pregnancy because it inhibits uterine contractions and prevents shedding of the endometrium. Therefore, sustained progesterone maintains the lining, rather than estrogen alone or FSH.

• If a patient exhibits persistent inflammation despite immunosuppressant treatment, which mechanism likely indicates a failure in peripheral immune tolerance involving regulatory T cells?
• A patient undergoing chemotherapy experiences neutropenia, resulting in a severely compromised immune system. Which mechanism explains why opportunistic fungal infections, like aspergillosis, become life-threatening during this period?
• If a growth factor receptor mutation in cancer cells disables the intrinsic apoptosis pathway while nutrient supply decreases, which consequence follows?
• If a new oral drug, designed to act on the central nervous system, exhibits a very high first-pass metabolism, which consequence follows?
• In a patient with chronic anemia treated with high-altitude residence to stimulate erythropoiesis, which effect dominates the hemoglobin-oxygen dissociation curve?
• Why does systemic vasodilation occur in severe allergic reactions involving ingested shellfish?