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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
Describe the role of pituitary and ovarian hormones during the menstrual cycle in a human female.
Give a significant point of difference between the oestrous and menstrual cycles.
Identify the phase of the menstrual cycle during which there is a peak in the level of progesterone.
Which one of the following events occurs during the secretory phase of the menstrual cycle?
In the human female, menstruation can be deferred by the administration of ______.
Which one of the following events is correctly matched with the time period in a normal menstrual cycle?
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 structure in the ovary will remain functional in subject 2?
In case the ova does not fertilize, which of the following events will take place?
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 egg is passed down through the oviduct by muscular contractions.
