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प्रश्न
Why are menstrual cycles absent during pregnancy?
Menstrual cycles are absent during pregnancy. Why?
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उत्तर
The high levels of progesterone and estrogens during pregnancy suppress the gonadotropins which is required for the development of new follicles. Therefore, a new cycle cannot be initiated.
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संबंधित प्रश्न
Which hormones regulate menstrual cycle?
Define Amenorrhea
Define the following term :
Ovulation
‘A proper understanding of the menstrual cycle can help immensely in family planning.’ Do you agree with the statement? Provide reasons for your answer.
Name the Following
Sloughing of the uterine wall during menstrual flow.
Give Technical Term:
The phase in the menstrual cycle in which the remnant of a follicle in the ovary turns to corpus luteum.
Read the following passage and answer the question that follows:
Rahini and her parents were watching a television programme. An advertisement flashed on the screen which was promoting the use of sanitary napkins. Rahini’s parents suddenly changed the channel, but she objected to her parents and explained the need and importance of such an advertisement.
What is first menstruation called? When does it occur?
What are the phases of the menstrual cycle? Indicate the changes in the ovary and uterus.
The menstrual cycle ceases during pregnancy.
Answer the following type of question Assertion (A) and Reason (R).
(A) - Ovulation is the release of the ovum from the Graafian follicle.
(R) - It occurs during the follicular phase of the menstrual cycle.
Expand the acronym.
FSH
The following is the illustration of the sequence of ovarian events (a-i) in a human female.
Explain the changes that occur in the uterus simultaneously in anticipation.
The temporary endocrine gland in humans is ______.
On the fourteenth day of the menstrual cycle the female gamete released is _____.
Immediately after ovulation, the mammalian egg is covered by a membrane known as ______.
The mammalian corpus luteum produces ______.
Secretion of progesterone by corpus luteum is initiated by ______.
Which set is similar?
Ovulation in the human female normally takes place during the menstrual cycle ______.
Withdrawal of which of the following hormones is the immediate cause of menstruation?
To answer the question, study the graphs below for Subjects 1 and 2 showing different levels of certain hormones.
The peak observed in Subject 1 and 2 is due to ______
In case the ova does not fertilize, which of the following events will take place?
Distinguish between pollination and fertilisation. Mention the site and product of fertilisation in a flower.
Draw a neat, labelled diagram of a pistil showing pollen tube growth and its entry into the ovule.
Exit from the cell cycle and remain dormant for long time by a cell is represented by one of the following phases of the cell cycle:
About which day in a normal human menstrual cycle does rapid secretion of LH (Popularly called LH Surge) normally occurs?
The figure show a section of human ovary. Select the option which gives the correct identification of either A or B with function/characteristic.
Name the following:
The permanent stoppage of menstruation in human females around the age of 45 years.
The first menstruation is called ______.
Which of the following statements are correct regarding female reproductive cycle?
- In non-primate mammals cyclical changes during reproduction are called oestrus cycle.
- First menstrual cycle begins at puberty and is called menopause.
- Lack of menstruation may be indicative of pregnancy.
- Cyclic menstruation extends between menarche and menopause.
Choose the most appropriate answer from the options given below:
