Follicular phase is also called

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(C) The follicular phase is also known as the proliferative phase.Generally,the menstrual cycle consists of four phases:$(i)$ Menstrual phase: $(a)$ T

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Proliferative phase

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(C) The follicular phase is also known as the proliferative phase.Generally,the menstrual cycle consists of four phases:$(i)$ Menstrual phase: $(a)$ The soft tissue of the endometrial lining of the uterus disintegrates,causing bleeding. $(b)$ The unfertilized egg and soft tissue are discharged. $(c)$ It lasts for $3-5$ days.$(ii)$ Follicular Phase/Proliferative Phase: $(a)$ The primary follicles in the ovary grow and become a fully mature Graafian follicle. $(b)$ The endometrium of the uterus is regenerated due to the secretion of $LH$ and $FSH$ from the anterior pituitary and the ovarian hormone,estrogen. $(c)$ It lasts for about $10-14$ days.$(iii)$ Ovulatory Phase: $(a)$ Rapid secretion of $LH$ ($LH$ surge) induces the rupture of the Graafian follicle,thereby leading to ovulation (release of the ovum). $(b)$ It lasts for only about $48 \; hr$.$(iv)$ Luteal Phase/Secretory Phase: $(a)$ In this phase,the ruptured follicle changes into the corpus luteum in the ovary,and it begins to secrete the hormone progesterone. $(b)$ The endometrium thickens further,and its glands secrete a fluid into the uterus. $(c)$ If the ovum is not fertilized,the corpus luteum undergoes degeneration,which causes the disintegration of the endometrium,leading to menstruation.

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