Advertisements
Advertisements
Question
What role does pituitary gonadotropins play during follicular and ovulatory phases of menstrual cycle? Explain the shifts in steroidal secretions.
Advertisements
Solution
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.
APPEARS IN
RELATED QUESTIONS
Describe the role of pituitary and ovarian hormones during the menstrual cycle in a human female.
Draw a graafian follicle and label antrum and secondary oocyte.
How can the scientific understanding of the menstrual cycle of human females help as a contraceptive measure?
Explain the role of hormones during the menstrual cycle.
Describe the phases of the menstrual cycle and their hormonal control.
Follicle stimulating hormone : Development of oocyte : : Luteinizing hormone : ____________
Match the Columns.
| Column I | Column II | ||
| i. | Proliferative phase | a. | Breakdown of the endometrial lining |
| ii. | Secretory phase | b. | Follicular phase |
| iii. | Menstruation | c. | Luteal phase |
Choose the correct order of phases of the menstrual cycle.
All occur during follicular phase of menstrual cycle, EXCEPT
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?
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.
Which of the following events is not associated with ovulation in human females?
The level of progesterone is high at which phase in the menstrual cycle?
What are the events taking place in the ovary and uterus during follicular phase 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?
Write a short note on Proliferative Phase.
Name the following:
The permanent stoppage of menstruation in human females around the age of 45 years.
Name these:
4 phases of the menstrual cycle.
