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प्रश्न
Describe the roles of pituitary and ovarian hormones during the menstrual cycle in a human female.
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
Mention one significant difference between Hormones of ovulatory phase and hormones of luteal phase
Observe the figure and answer the questions given below.
a) What does the above figure indicate?
b) Which human organs are involved in this process?
c) Name the hormones responsible for this process.
d) After how many days these repetitive changes take place?
e) ‚A woman should stay away from others, as her body is impure during this process.‛ What is your opinion about this statement? Elaborate it.
Define: Menarche
Name the Following
The onset of menstruation in a young girl at about the age of 13 years.
Complete the following sentences with appropriate word:
The human gestation period is about ____________.
Find the wrongly matched pair.
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.
In the human female, menstruation can be deferred by the administration of ______.
The Corpus luteum grows during menstruation.
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?
