Menstrual cycle - Wikipedia
The menstrual cycle is a series of natural changes in hormone production and the structures of the uterus and ovaries of the female reproductive system that makes pregnancy possible. The ovarian cycle controls the production and release of eggs and the …
Human Reproductive Cycle | The Biology of Sex and Death (Bio …
Identify and describe functions of key anatomical reproductive structures present in various types of animals, including the spermatheca, the cloaca, the ovary and related structures, and the testes and related structures
Menstrual Cycle (Normal Menstruation): Overview & Phases - Cleveland Clinic
A menstrual cycle begins when you get your period or menstruate. This is when you shed the lining of your uterus. This cycle is part of your reproductive system and prepares your body for a possible pregnancy. A typical cycle lasts between 24 and 38 days.
Stages of the Menstrual Cycle - Healthline
2023年3月13日 · We’ll tell you all about the menstrual, follicular, ovulation, and luteal phases of your cycle, as well as what hormones and symptoms are at play in each of these phases.
Menstrual Cycle: An Overview - Johns Hopkins Medicine
Menstruation is one part of a woman's cycle when the lining of the uterus (endometrium) is shed. This occurs throughout a woman's reproductive life. With each monthly cycle, the endometrium prepares itself to nourish a fetus. Increased levels of estrogen and …
Physiology, Menstrual Cycle - StatPearls - NCBI Bookshelf
2024年9月27日 · The menstrual cycle is a crucial indicator of a female's reproductive health, and any abnormalities in menstruation necessitate thorough evaluation. A thorough understanding of menstrual physiology is important for clinicians, as it allows them to diagnose and manage various gynecological issues, including both hormonal and structural pathologies.
The Normal Menstrual Cycle and the Control of Ovulation
2018年8月5日 · Menstruation is the cyclic, orderly sloughing of the uterine lining, in response to the interactions of hormones produced by the hypothalamus, pituitary, and ovaries. The menstrual cycle may be divided into two phases: (1) follicular or proliferative phase, and (2) the luteal or secretory phase.
menstrual cycle - Encyclopedia Britannica
2024年10月24日 · menstrual cycle, recurring fluctuations in hormone levels that produce physical changes in the uterus and ovaries to prepare the female body for pregnancy. In adult women, the menstrual cycle lasts anywhere from 21 to 40 days, with the average being 28 days.
Menstrual Cycle - Menstrual Cycle - MSD Manual Consumer …
Menstruation is the shedding of the lining of the uterus (endometrium) accompanied by bleeding. It occurs in approximately monthly cycles throughout a woman's reproductive life, except during pregnancy. Menstruation starts during puberty (at menarche) and stops permanently at …
18.3: Human Reproduction - Biology LibreTexts
2021年9月23日 · As in all animals, the adaptations for reproduction in humans are complex. They involve specialized and different anatomies in the two sexes, a hormone regulation system, and specialized behaviors regulated by the brain and endocrine system.