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प्रश्न
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?
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उत्तर
- 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.
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संबंधित प्रश्न
Describe the changes that occur in ovaries and uterus in human female during the reproductive cycle.
Name the function of the following:
Corpus luteum
Define Amenorrhea
Explain the menstruation phases in the menstrual cycle of a human female.
Give Technical Term:
The phase in the menstrual cycle in which the remnant of a follicle in the ovary turns to corpus luteum.
Meanrch, menstrual cycle, and menopause are controlled by ______.
The menstrual cycle ceases during pregnancy.
Which one of the following menstrual irregularities is correctly matched?
Answer the following type of question Assertion (A) and Reason (R).
(A) - Ovulation is the release of the ovum from the Graafian follicle.
(R) - It occurs during the follicular phase of the menstrual cycle.
Lack of which hormone results in menstrual flow?
The life of corpus luteum is generally about ______ days in the absence of pregnancy
When does ovulatory phase occur?
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.
Menstrual flow occurs due to lack of ______.
After ovulation the collapsed ovarian follicle shrinks and becomes filled with cell to form:
A human female experiences two major changes, menarche and menopause during her life. Mention the significance of both the events.
Complete the table:
| Number | Type | No. of pairs | Region |
| C1C8 | Cervical | ______ | Neck |
| T1T12 | ______ | 12 pairs | ______ |
| L1L5 | Lumbar | ______ | Lower back |
| S1S5 | ______ | 5 pairs | ______ |
| CO1 | Coccygeal | ______ | ______ |
In the human menstrual cycle, the ovulation occurs around ______.
Which of the following organs primarily undergo cyclic changes during the menstrual cycle?
