Why are menstrual cycles absent during pregnancy ?

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2.Human Reproduction

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Why are menstrual cycles absent during pregnancy ?

Option A

Option B

Option C

Option D

Solution

The menstrual flow results due to break down of endometrial lining of the uterus and its blood vessels which forms liquid that comes out through vagina menstruation only occurs if the released ovum is not fertilised.

During pregnancy all these stages / phases of menstrual flow stop and corpus leuteum secretes projesterone in large amount which is necessary for care of endometrium. These changes don't let menstrual flow occur during pregnancy. Lack of menstruation may be indicative of pregnancy. However it may also be caused due to some other underlying cause like stress, poor health.

Standard 12

Biology

Assertion : Corpus luteum degenerates in the absence of fertilization.

Reason : Progesterone level decreases.

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(AIIMS-2009)

Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$.

Assertion $A$: Endometrium is necessary for implantation of blastocyst.

Reason $R$: In the absence of fertilization, the corpus luteum degenerates that causes disintegration of endometrium.

In the light of the above statements, choose the correct answer from the options given below:

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(NEET-2023)

Which of the following is false for progesterone ?

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Match the items given in the Column $I$ with those in Column $II$ and select the correct option given below:

Column $I$

Column $II$

$(a)$ Proliferative Phase

$(i)$ Breakdown of endometrical lining

$(b)$Secretory Phase

$(ii)$ Follicular phase

$(c)$ Menstruation

$(iii)$ Luteal Phase

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(NEET-2018)

What is menstrual cycle? Which hormones regulate menstrual cycle?

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Column $I$	Column $II$
$(a)$ Proliferative Phase	$(i)$ Breakdown of endometrical lining
$(b)$Secretory Phase	$(ii)$ Follicular phase
$(c)$ Menstruation	$(iii)$ Luteal Phase

Why are menstrual cycles absent during pregnancy ?

Solution

Similar Questions

Assertion : Corpus luteum degenerates in the absence of fertilization. Reason : Progesterone level decreases.

Which of the following is false for progesterone ?

Match the items given in the Column $I$ with those in Column $II$ and select the correct option given below: Column $I$ Column $II$ $(a)$ Proliferative Phase $(i)$ Breakdown of endometrical lining $(b)$Secretory Phase $(ii)$ Follicular phase $(c)$ Menstruation $(iii)$ Luteal Phase

What is menstrual cycle? Which hormones regulate menstrual cycle?

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Assertion : Corpus luteum degenerates in the absence of fertilization.

Reason : Progesterone level decreases.

Match the items given in the Column $I$ with those in Column $II$ and select the correct option given below:

Column $I$

Column $II$

$(a)$ Proliferative Phase

$(i)$ Breakdown of endometrical lining

$(b)$Secretory Phase

$(ii)$ Follicular phase

$(c)$ Menstruation

$(iii)$ Luteal Phase