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FranThe menstrual cycle is regulated by hormones produced by the hypothalamus, pituitary gland, and ovaries. The cycle starts with the release of follicle-stimulating hormone (FSH) and luteinizing hormone (LH) from the pituitary gland, which trigger the development of an egg in the ovary and prepare the uterus for pregnancy. If fertilization does not occur, hormone levels drop, leading to the shedding of the uterine lining and the start of a new cycle.
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How are events in the menstrual cycle triggered by the body?
The menstrual cycle is primarily regulated by hormones produced by the ovaries and the pituitary gland in the brain. At the beginning of the cycle, the brain releases hormones that stimulate the ovaries to start producing estrogen. As estrogen levels rise, it triggers the release of an egg from the ovary (ovulation) and prepares the uterus for a potential pregnancy. If fertilization does not occur, estrogen and progesterone levels drop, leading to menstruation.
The lining of the uterus is shed in which menstrual cycle stage?
The lining of the uterus is shed during the menstrual phase of the menstrual cycle. This is when the body sheds the built-up uterine lining in the absence of a fertilized egg, resulting in menstrual bleeding.
Which structures in the human body are directly affected by the hormones involved with the menstrual cycle?
The hormones involved in the menstrual cycle primarily affect the uterus, ovaries, fallopian tubes, and menstrual lining (endometrium). These hormones regulate the growth, shedding, and repair of these structures during the menstrual cycle.
What happens at the end of a menstrual cycle?
At the end of a menstrual cycle, the unfertilized egg is either absorbed by the body or expelled during menstruation. The lining of the uterus, which thickened in preparation for a possible pregnancy, sheds as menstrual bleeding. This marks the start of a new menstrual cycle.
What is the difference between the menstrual cycle and the period?
The menstrual cycle refers to the series of hormonal changes in a woman's body that prepare for a possible pregnancy each month. The period, or menstruation, is the shedding of the uterine lining when pregnancy does not occur, typically lasting 3-7 days.
