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Which of the following statements are in...

Which of the following statements are incorrect ?
1.The longest phase of the menstrual cycle is the follicular phase while the shortest phase is the ovulatory phase.
2.when blastulation occurs ,the uterus is the luteal phase with a well-developed endometrium
3. The formation of the haploid second polar body occurs just before ovulation.
4.permanent cessation of menses is an indication of pregnancy .

A

1,2,3,and 4

B

3 and 4

C

2,3 and 4

D

2,1 and 4

Text Solution

AI Generated Solution

The correct Answer is:
To determine which statements are incorrect regarding the menstrual cycle and related processes, let's analyze each statement step by step. ### Step 1: Analyze Statement 1 **Statement:** The longest phase of the menstrual cycle is the follicular phase while the shortest phase is the ovulatory phase. **Analysis:** - The menstrual cycle consists of several phases: menstruation, follicular phase, ovulation, and luteal phase. - The follicular phase lasts from day 1 to ovulation (approximately day 14), while the luteal phase lasts from ovulation to the start of menstruation (approximately day 28). - The luteal phase is longer than the follicular phase, making this statement incorrect. ### Step 2: Analyze Statement 2 **Statement:** When blastulation occurs, the uterus is in the luteal phase with a well-developed endometrium. **Analysis:** - Blastulation occurs after fertilization, leading to the formation of a blastocyst. - The luteal phase occurs after ovulation and is characterized by the presence of a corpus luteum, which supports the endometrium. - However, if pregnancy occurs, the menstrual cycle is halted, and the luteal phase is not relevant in the context of blastulation. Thus, while the endometrium is well-developed, stating that the uterus is in the luteal phase is misleading, making this statement incorrect. ### Step 3: Analyze Statement 3 **Statement:** The formation of the haploid second polar body occurs just before ovulation. **Analysis:** - The first polar body is formed during the first meiotic division, which occurs prior to ovulation. - The second polar body is formed after fertilization, not before ovulation. Therefore, this statement is incorrect. ### Step 4: Analyze Statement 4 **Statement:** Permanent cessation of menses is an indication of pregnancy. **Analysis:** - Permanent cessation of menses is referred to as menopause, which indicates the end of a woman's reproductive years. - Pregnancy results in a temporary cessation of menses, not a permanent one. Therefore, this statement is also incorrect. ### Conclusion All four statements provided in the question are incorrect. ### Final Answer All statements are incorrect. ---
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