Advertisements
Advertisements
Question
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?
Solution
- The menstrual cycle is a natural process, controlled by four hormones. Those four hormones are follicle-stimulating hormone (FSH), luteinizing hormone (LH), estrogen, and progesterone.
- The cycle consists of three phases-menstrual phase, the proliferative phase, and secretory phase.
- 14 days.
- If the embryo is implanted, repetition of this cycle is temporarily stopped till the parturition and thereafter period of breastfeeding.
- If oocyte is not fertilized within 24 hours, corpus luteum becomes inactive and transforms into corpus Albicans. Due to this, secretion of estrogen and progesterone stops completely. Endometrium starts to degenerate in absence of these two hormones.
APPEARS IN
RELATED QUESTIONS
Explain the events that occur in a graafian follicle at the time of ovulation and thereafter.
Uterus, Parturition, Fertilisation, Gestation, Implantation.
How can the scientific understanding of the menstrual cycle of human females help as a contraceptive measure?
Give appropriate terms for each of the following process:
Fixing of developing zygote (blastocyst) on the uterine wall.
Sketch the labeled diagram:
Menstrual cycle
Choose the correct answer from the four options given below :
On which day of the menstrual cycle does ovulation take place ?
Give Reasons
Missing of menses is the first indication of pregnancy.
Describe the structure of Graafian follicle.
Which one of the following menstrual irregularities is correctly matched?
Expand the acronym.
FSH
Detection of which hormone in urine is an indicator of pregnancy?
When does ovulatory phase occur?
Mainly which type of hormones control the menstrual cycle in human beings?
Which one of the following events is correctly matched with the time period in a normal menstrual cycle?
Exit from the cell cycle and remain dormant for long time by a cell is represented by one of the following phases of the cell cycle:
When does the corpus luteum degenerate?
Why are menstrual cycles absent during pregnancy?
The figure show a section of human ovary. Select the option which gives the correct identification of either A or B with function/characteristic.
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?
Name these:
4 phases of the menstrual cycle.
