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प्रश्न
Describe the roles of pituitary and ovarian hormones during the menstrual cycle in a human female.
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उत्तर
- Pyramid of energy is a graphical representation of the amount of accumulated energy per unit area in different trophic levels of a food chain.
- An energy pyramid is always upright because there is a gradual decrease in energy at successive trophic levels. This happens because, according to the 10% law of energy transfer, only 10% of the total energy is transferred from one trophic level to another.
- The energy is highest at the producer level and it gradually decreases on moving from herbivores to carnivores.
- As the oestrogen levels increase the endometrium begins to regenerate along with the development of uterine glands and network of blood vessels.
- The corpus luteum starts secreting progesterone, oestrogen, and inhibin. The endometrium proliferates under the influence of these hormones, as do the endometrial gland and blood vessels. Inhibin inhibits FSH and GnRH secretion.
- When there is no fertilisation, the corpus luteum degenerates, progesterone levels drop, and the next menstrual cycle begins.
- Thus, pituitary and ovarian hormones work together to regulate all phases of the menstrual cycle.
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संबंधित प्रश्न
Sketch the labelled diagram.
Menstrual cycle
Multiple Choice Question:
The onset of menstruation in the female is termed
Which one of the following is the correct matching of the events occurring during menstrual cycle?
The endometrium in the female is the lining of ______.
A biology student after studying the different levels of hormones during the menstrual cycle was comparing 2 subjects (Patients). A table was created after looking at the levels of hormones A and B for Subjects 1 and 2. Read the information in the table and answer the question that follows.
| HORMONE A | HORMONE B | |
| Subject 1 | Shows a peak on the 14th Day of the menstrual cycle. | Falls down during the luteal phase. |
| Subject 2 | Shows a peak on the 14th Day of the menstrual cycle. | The level is maintained high in the luteal phase. |
Which of the following statements is true about the subjects?
At which stage of the menstrual cycle, both LH and FSH are high?
Describe hormonal control in various phases of the menstrual cycle.
Answer the following questions by observing the diagram of menstrual cycle:
- What is the period of menstruation?
- On which day does ovulation occur during the menstrual cycle?
- In the menstrual cycle which reproductive organs undergo changes?
- Which period is said to be the period of regeneration of endometrium?
- Which period is said to be the period of secretions of glands in endometrium?
What is the average duration of the menstrual cycle?
How many phases does the menstrual cycle consist of?
