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प्रश्न
Why are menstrual cycles absent during pregnancy?
Menstrual cycles are absent during pregnancy. Why?
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उत्तर
The high levels of progesterone and estrogens during pregnancy suppress the gonadotropins which is required for the development of new follicles. Therefore, a new cycle cannot be initiated.
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संबंधित प्रश्न
Describe the role of pituitary and ovarian hormones during the menstrual cycle in a human female.
Explain the role of pituitary and the ovarian hormones in menstrual cycle in human females
Why is follicular phase in the menstrual cycle also referred as proliferative phase? Explain.
Uterus, Parturition, Fertilisation, Gestation, Implantation.
The human female gonads are ovaries. A maturing egg in the ovary is present in a sac of cells called ______ (1). As the egg grows larger, the follicle enlarges and gets filled with a fluid and is now called the ______ (2) follicle. The process of releasing the egg from the ovary is called ______ (3). The ovum is picked up by the oviducal funnel and fertilization takes place in the ______ (4). In about a weak the blastocyst gets fixed in the endometrium of the uterus and this process is called ______ (5).
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 ?
Define: Menarche
Complete the following sentences with appropriate word:
The human gestation period is about ____________.
Multiple Choice Question:
The onset of menstruation in the female is termed
Describe the phases of the menstrual cycle and their hormonal control.
Explain the ovarian cycle with its different phases.
Explain the importance of cleanliness during the time of menstrual cycle in girls.
Menstruation begins due to ______.
Luteal phase is also known as ____________.
Corpus luteum produces ______.
Which set is similar?
Mature Graafian follicle is generally present in the ovary of a healthy human female around stet ______.
A human female reaches menopause aroung the age 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 structure in the ovary will remain functional in subject 2?
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:
Identify the correct statement from the following:
What are the events taking place in the ovary and uterus during follicular phase of the menstrual cycle.
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?
Write a short note on Secretory Phase.
The egg is passed down through the oviduct by muscular contractions.
Given below is a group of terms. In the group, one pair indicates the relationship between the two terms. Rewrite and complete the second pair on a similar basis.
Follicular phase: 5-12 days:: Luteal phase : ______ days.
The first menstruation is called ______.
