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प्रश्न
What role does pituitary gonadotropins play during follicular and ovulatory phases of menstrual cycle? Explain the shifts in steroidal secretions.
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उत्तर
Menstrual cycle is regulated by hypothalamus through the pituitary gland. At the end of menstrual phase, the pituitary FSH gradually increases resulting in follicular development within the ovaries. As the follicles mature, Estrogen secretion increases resulting in a surge in (FSHe and LH) The surge of LH15 responsible for ovulation. LH also gonadotropins induces luteinisation. This leading to the formation of corpus luteum. Corpus luteum secretes progesterone and source estrogen which help in maintaining the interine endometrium for implantation.
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संबंधित प्रश्न
Explain the menstrual phase in a human female. State the levels of ovarian and pituitary hormones during this phase.
Describe the roles of pituitary and ovarian hormones during the menstrual cycle in a human female.
Identify True/False statement. Correct false statement to make it true.
Menstrual cycle ceases during pregnancy.
Explain the events that occur in a graafian follicle at the time of ovulation and thereafter.
Mention one significant difference between Hormones of ovulatory phase and hormones of luteal phase
Multiple Choice Question:
The onset of menstruation in the female is termed
How many pairs of testis are present in human male?
Find the wrongly matched pair.
Which one of the following events occurs during the secretory phase of the menstrual cycle?
The correct sequence of hormone secretion from the beginning of menstruation is ______.
Which one of the following is the correct matching of the events occurring during menstrual cycle?
Proliferative phase of menstrual cycle, is also called ______.
In case the ova does not fertilize, which of the following events will take place?
Observe the figure and label it properly.
- Name the hormone that regulates the cycle.
- Name the phases in this cycle.
- What is the duration of ovulation phase?
- What happens if implantation occurs?
- What happens if implantation does not occur?
In the figure given below, parts A and B show the level of hormones which influence the menstrual cycle. Study the figure and answer the questions that follow:
- Name the organs which secrete the hormones represented in parts A and B.
- State the impact of the hormones in part B on the uterus of the human female during 6 to 15 days of the menstrual cycle.
The graph given below shows the number of primordial follicles per ovary in women at different ages. Study the graph and answer the questions that follow.
- What is the average age of the women at the onset of menopause?
- At what age are maximum primordial follicles present in the ovary, according to the given graph?
The enlarged mature follicle bursts to release the egg.
The egg is passed down through the oviduct by muscular contractions.
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:
