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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
Explain the menstrual phase in a human female. State the levels of ovarian and pituitary hormones during this phase.
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
Menarche is the stoppage of menstruation.
Multiple choice question.
Rupturing of follicles and discharge of ova is known as _______.
Describe the structure of a Graafian follicle.
Explain the ovarian cycle with its different phases.
Follicle stimulating hormone : Development of oocyte : : Luteinizing hormone : ____________
State the names of four hormones which control menstrual cycle.
Which one of the following menstrual irregularities is correctly matched?
Explain the various phases of the menstrual cycle.
The life of corpus luteum is generally about ______ days in the absence of pregnancy
If the corpus luteum is present in the ovary even after 72 hours after ovulationit indicates that ______.
Menstruation begins due to ______.
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 |
On the fourteenth day of the menstrual cycle the female gamete released is _____.
Ovulation in the human female normally takes place during the menstrual cycle ______.
In the human female, menstruation can be deferred by the administration of ______.
Corpus luteum develops from ______.
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. |
If the peak of Hormone A does not appear in the study for Subject 1, which of the following statement is true?
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?
The figure show a section of human ovary. Select the option which gives the correct identification of either A or B with function/characteristic.
Give a reason for the following:
The second half of the menstrual cycle is called the luteal phase as well as the secretory phase.
Complete the following table by writing the name of the structure or the function of the given structure:
| Structure | Function | ||
| 1. | Corpus luteum | 1. | ______ |
| 2. | ______ | 2. | Produces male gametes in mass |
| 3. | Leydig cells | 3. | ______ |
| 4. | ______ | 4. | Stores the sperms until they mature and become mobile |
| 5. | Umbilical cord | 5. | ______ |
| 6. | Fallopian tube | 6. | ______ |
Which of the following statements are correct regarding female reproductive cycle?
- In non-primate mammals cyclical changes during reproduction are called oestrus cycle.
- First menstrual cycle begins at puberty and is called menopause.
- Lack of menstruation may be indicative of pregnancy.
- Cyclic menstruation extends between menarche and menopause.
Choose the most appropriate answer from the options given below:
What is the average duration of the menstrual cycle?
On approximately which day of the menstrual cycle does ovulation occur?
