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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 roles 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
What is menstrual cycle?
Why is follicular phase in the menstrual cycle also referred as proliferative phase? Explain.
Mention one significant difference between Hormones of ovulatory phase and hormones of luteal phase
Define the following term :
Ovulation
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.
Explain the changes that occur in the ovary and uterus during menstrual cycle in human females. Mention the influence of pituitary and ovarian hormones in bringing these changes.
Name the Following
Sloughing of the uterine wall during menstrual flow.
Name the Following
The term used when females stop menstruation at the age of 45-50 years.
Describe the structure of a Graafian follicle.
What are the phases of the menstrual cycle? Indicate the changes in the ovary and uterus.
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 humans, the menstrual cycle is generally of ______.
Menstruation begins due to ______.
How long does the secretory phase of the menstrual cycle last?
In the absence of fertilization, corpus luteum ____________.
Choose the correct order of phases of the menstrual cycle.
All occur during follicular phase of menstrual cycle, EXCEPT
____________ is transformed to corpus luteum during luteal phase of the menstrual cycle.
In the human female, menstruation can be deferred by the administration 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?
The menstrual cycle begins with ______
At which stage of the menstrual cycle, both LH and FSH are high?
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?
Complete the table:
| Number | Type | No. of pairs | Region |
| C1C8 | Cervical | ______ | Neck |
| T1T12 | ______ | 12 pairs | ______ |
| L1L5 | Lumbar | ______ | Lower back |
| S1S5 | ______ | 5 pairs | ______ |
| CO1 | Coccygeal | ______ | ______ |
Name the following:
The permanent stoppage of menstruation in human females around the age of 45 years.
Given below is the diagram depicting the menstrual cycle in human beings. Study it carefully and answer the questions that follow.
- Which phases are indicated by ‘C’ and ‘D’?
- Name the structures labelled ‘F’. What is its role?
- Explain the changes in the level of progesterone during phases ‘C’ and ‘D’.
- Which hormone present in the urine confirms pregnancy in human beings?
- Identify the structure labelled ‘E’. Name the hormone released by it.
