In 28 day human ovarian cycle ovulation occurs in
A. Day 14
B. Day 28
C. Day 5
D. Day 1
Correct Answer: Day 14
Explanation
In a 28-day human ovarian (menstrual) cycle, ovulation typically occurs on the 14th day.
Answer:
Ovulation occurs around day 14 of a 28-day cycle.
Explanation
The menstrual cycle is counted from Day 1, which is the first day of menstruation (bleeding).
The cycle has two main phases:
1. Follicular phase (Day 1–14): A follicle in the ovary matures under the influence of FSH.
2. Luteal phase (Day 15–28): After ovulation, the corpus luteum forms and secretes progesterone.
• Ovarian is the process where a mature Graafian follicle ruptures and releases an ovum (egg).
• This generally occurs 14 days before the next expected period.
Key Point Memory Tip
👉If the cycle length changes, ovulation is still 14 days before the next period, not necessarily on Day 14.
Cycle Length Ovulation Day
• 28 days Day 14
• 30 days Day 16
• 26 days Day 12
Best Time for Pregnancy
The fertile window is Day 11–16 (5 days before and 1 day after ovulation).
Other Options Details
You are asking about the human ovarian cycle and the options A–D likely refer to specific days of the cycle. Let’s describe each option carefully:
A. Day 14
- Significance: This is typically the day of ovulation in a standard 28-day cycle.
- Process: Around day 14, the mature Graafian follicle ruptures and releases an ovum (egg) into the fallopian tube.
- Hormonal changes:
- Surge in Luteinizing Hormone (LH) triggers ovulation.
- Follicle-Stimulating Hormone (FSH) slightly rises to support follicle maturation.
- Fertility: This is the most fertile period of the cycle.
B. Day 28
- Significance: This usually corresponds to the end of the menstrual cycle and the beginning of menstruation if fertilization has not occurred.
- Process:
- If the ovum is not fertilized, the corpus luteum degenerates, progesterone and estrogen levels fall.
- The uterine lining (endometrium) sheds, causing menstrual bleeding.
- Hormonal changes: Drop in progesterone and estrogen triggers menstruation.
C. Day 5
- Significance: This is usually the menstrual phase (end of menstruation) and the beginning of the follicular phase.
- Process:
- The uterus is shedding the remaining endometrial lining.
- Several follicles in the ovary begin maturation under FSH stimulation.
- Hormonal changes:
- Low estrogen and progesterone levels.
- Rising FSH promotes follicle growth.
D. Day 1
- Significance: This is the first day of menstruation, marking the start of the ovarian cycle.
- Process:
- Shedding of the endometrial lining begins.
- Follicles start to grow in the ovary (early follicular phase).
- Hormonal changes:
- Low estrogen and progesterone levels.
- FSH starts to rise, stimulating follicle development.
Summary of Phases in Relation to Days: Day Phase Key Event 1 Menstrual/Start of cycle Shedding of endometrium 5 Menstrual/Follicular Follicle maturation begins 14 Ovulatory Ovulation occurs 28 Luteal/End of cycle Corpus luteum degenerates if no fertilization
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Writer: Vandita Singh, Lucknow (GS India Nursing Group)