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If mammalian ovum fails to get fertilized, which one of the following is unlikely?
[2005]
- a)Corpus luteum will disintegrate
- b)Progesterone secretion rapidly declines
- c)Estrogen secretion further decreases
- d)Primary follicle starts developing
Correct answer is option 'C'. Can you explain this answer?
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If mammalian ovum fails to get fertilized, which one of the following ...
Since corpus luteum degenerates so progesterone also decreases rapidly (progesterone is essential for maintenance of pregnancy).
Also estrogen continues to curve growth of the endometrium which ultimately becomes thick enough to break down and cause menstruation. Hence choice (c) is unlikely as estrogen secretion does not decreases further.
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If mammalian ovum fails to get fertilized, which one of the following ...
Explanation:
If the mammalian ovum fails to get fertilized, the following events occur:
1. Corpus luteum will disintegrate: Corpus luteum is formed from the remnants of the follicle after ovulation. It secretes progesterone which helps in maintaining the endometrium lining of the uterus. If fertilization does not occur, corpus luteum will degenerate due to lack of hCG (human chorionic gonadotropin) hormone which is released by the developing embryo. This will cause a decrease in progesterone secretion and the endometrium will start to break down.
2. Progesterone secretion rapidly declines: As mentioned earlier, the corpus luteum will degenerate due to lack of hCG hormone. This will lead to a rapid decline in progesterone secretion. Progesterone is necessary for the maintenance of the endometrium. Its decrease will cause the endometrium to break down and menstruation will occur.
3. Estrogen secretion further decreases: Estrogen is secreted by the developing follicle before ovulation. After ovulation, the corpus luteum secretes estrogen along with progesterone. If fertilization does not occur, the corpus luteum will disintegrate and estrogen secretion will decrease. But it is not unlikely as the primary follicle starts developing after the corpus luteum degenerates.
4. Primary follicle starts developing: After the disintegration of corpus luteum, the primary follicle starts developing for the next ovulatory cycle. This process is not affected by the absence of fertilization.
Hence, option C is unlikely as estrogen secretion further decreases after the absence of fertilization.
If the mammalian ovum fails to get fertilized, the following events occur:
1. Corpus luteum will disintegrate: Corpus luteum is formed from the remnants of the follicle after ovulation. It secretes progesterone which helps in maintaining the endometrium lining of the uterus. If fertilization does not occur, corpus luteum will degenerate due to lack of hCG (human chorionic gonadotropin) hormone which is released by the developing embryo. This will cause a decrease in progesterone secretion and the endometrium will start to break down.
2. Progesterone secretion rapidly declines: As mentioned earlier, the corpus luteum will degenerate due to lack of hCG hormone. This will lead to a rapid decline in progesterone secretion. Progesterone is necessary for the maintenance of the endometrium. Its decrease will cause the endometrium to break down and menstruation will occur.
3. Estrogen secretion further decreases: Estrogen is secreted by the developing follicle before ovulation. After ovulation, the corpus luteum secretes estrogen along with progesterone. If fertilization does not occur, the corpus luteum will disintegrate and estrogen secretion will decrease. But it is not unlikely as the primary follicle starts developing after the corpus luteum degenerates.
4. Primary follicle starts developing: After the disintegration of corpus luteum, the primary follicle starts developing for the next ovulatory cycle. This process is not affected by the absence of fertilization.
Hence, option C is unlikely as estrogen secretion further decreases after the absence of fertilization.
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If mammalian ovum fails to get fertilized, which one of the following ...
If estrogen secretion further decreases the endometrium lining of uterus start break and their blood vessels also start breaking due to which ovum fails to get fertilise
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If mammalian ovum fails to get fertilized, which one of the following is unlikely?[2005]a)Corpus luteum will disintegrateb)Progesterone secretion rapidly declinesc)Estrogen secretion further decreasesd)Primary follicle starts developingCorrect answer is option 'C'. Can you explain this answer?
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