The secretory phase is the latter part of the menstrual cycle, occurring after ovulation, where the endometrium becomes more glandular and vascularized under the influence of progesterone, preparing for potential implantation of an embryo. If fertilization does not occur, this phase culminates in menstruation as hormone levels drop and the endometrial lining is shed.

Secretory Phase

The menstrual cycle is a natural, recurring process that prepares the female body for pregnancy, involving hormonal changes that regulate ovulation and menstruation. It typically lasts around 28 days, but can vary, and is divided into phases including the menstrual, follicular, ovulation, and luteal phases.

Menstrual Cycle

Ovulation is the process in the menstrual cycle where a mature egg is released from the ovary, making it available for fertilization. It typically occurs around the midpoint of the cycle and is regulated by hormonal changes, particularly the surge in luteinizing hormone (LH).

Ovulation

The endometrium is the inner lining of the uterus, playing a crucial role in the menstrual cycle and pregnancy. It thickens in response to hormonal changes to prepare for potential implantation of an embryo, and sheds during menstruation if implantation does not occur.

Endometrium

Glandular

Vascularized

Progesterone is a steroid hormone that plays a crucial role in regulating the menstrual cycle and maintaining pregnancy in females. It is produced mainly in the ovaries, placenta, and adrenal glands and also influences other physiological functions, such as immune response and brain function.

Progesterone

Implantation of an embryo

Fertilization is the process where a sperm cell and an egg cell unite to form a zygote, initiating the development of a new organism. It is a critical step in sexual reproduction, ensuring genetic diversity and the continuation of species.

Fertilization

Menstruation is a natural biological process in which the uterine lining is shed, resulting in bleeding through the vagina, occurring typically on a monthly cycle in individuals with female reproductive systems. It is a critical component of the menstrual cycle, which prepares the body for potential pregnancy and involves hormonal changes, physical symptoms, and emotional fluctuations.

Menstruation

Hormone levels refer to the concentration of hormones in the bloodstream, which play a crucial role in regulating various physiological processes such as metabolism, growth, and mood. Imbalances in hormone levels can lead to significant health issues, making their regulation essential for maintaining homeostasis in the body.

Hormone Levels

The endometrial lining is the inner layer of the uterus that thickens in response to hormonal changes during the menstrual cycle to prepare for potential implantation of an embryo. If implantation does not occur, the lining is shed during menstruation, playing a crucial role in reproductive health and fertility.

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