High school / pre-med / IB practice on female reproductive anatomy, ovarian + uterine cycles, endocrine feedback (GnRH–LH/FSH–ovary), oogenesis/meiosis timing (n, chromatids/DNA molecules), ovulation, fertilization, implantation, and key pregnancy/lactation hormones.
Which structure is the primary site of oocyte maturation and ovarian hormone production (estrogen/progesterone)?
Source: entermedschool.org
<!-- Female Reproductive System: Hormones, Cycle, Anatomy & Oogenesis — EnterMedSchool -->
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src="https://entermedschool.org/embed/questions#{"title":"Female Reproductive System: Hormones, Cycle, Anatomy & Oogenesis","questions":[{"prompt":"Which structure is the primary site of oocyte maturation and ovarian hormone production (estrogen/progesterone)?","options":[{"label":"A","body":"Uterus","isCorrect":false},{"label":"B","body":"Ovary","isCorrect":true},{"label":"C","body":"Cervix","isCorrect":false},{"label":"D","body":"Vagina","isCorrect":false},{"label":"E","body":"Fallopian tube (oviduct)","isCorrect":false}],"explanation":"The ovary produces oocytes (oogenesis) and secretes estrogen and progesterone (via follicles/corpus luteum). The uterus is mainly for implantation and fetal development; the oviduct is mainly for transport and fertilization."},{"prompt":"In a typical menstrual cycle, fertilization most commonly occurs in the:","options":[{"label":"A","body":"Cervix","isCorrect":false},{"label":"B","body":"Uterine cavity","isCorrect":false},{"label":"C","body":"Ampulla of the fallopian tube","isCorrect":true},{"label":"D","body":"Vagina","isCorrect":false},{"label":"E","body":"Ovary itself (inside the follicle)","isCorrect":false}],"explanation":"Fertilization most often happens in the ampulla of the oviduct. Implantation occurs later in the uterus. The ovary releases the oocyte; fertilization usually does not occur inside the follicle."},{"prompt":"The endometrium is best described as the:","options":[{"label":"A","body":"Muscular outer layer of the uterus responsible for contractions","isCorrect":false},{"label":"B","body":"Inner lining of the uterus that thickens and is shed during menstruation","isCorrect":true},{"label":"C","body":"Inner lining of the vagina","isCorrect":false},{"label":"D","body":"Outer capsule of the ovary","isCorrect":false},{"label":"E","body":"Tube that carries the oocyte to the ovary","isCorrect":false}],"explanation":"The endometrium is the uterine lining that proliferates under estrogen and becomes secretory under progesterone; it is shed during menstruation if no pregnancy occurs. The myometrium is the muscular uterine layer."},{"prompt":"Which uterine layer is primarily responsible for labor contractions?","options":[{"label":"A","body":"Endometrium","isCorrect":false},{"label":"B","body":"Myometrium","isCorrect":true},{"label":"C","body":"Perimetrium","isCorrect":false},{"label":"D","body":"Zona pellucida","isCorrect":false},{"label":"E","body":"Corpus luteum","isCorrect":false}],"explanation":"The myometrium is the smooth muscle layer of the uterus and generates strong contractions during labor. Endometrium is the lining; corpus luteum is in the ovary."},{"prompt":"The cervix is best described as the:","options":[{"label":"A","body":"Upper part of the fallopian tube","isCorrect":false},{"label":"B","body":"Narrow lower part of the uterus that opens into the vagina","isCorrect":true},{"label":"C","body":"Part of the ovary that forms the corpus luteum","isCorrect":false},{"label":"D","body":"Site of oocyte meiosis I completion","isCorrect":false},{"label":"E","body":"Muscle that expels the oocyte during ovulation","isCorrect":false}],"explanation":"The cervix is the lower uterine region connecting to the vagina; it produces cervical mucus that changes across the cycle. Ovulation occurs at the ovary, not the cervix."},{"prompt":"During ovulation, the oocyte is released from the ovary and is captured most directly by the:","options":[{"label":"A","body":"Uterine myometrium","isCorrect":false},{"label":"B","body":"Fimbriae of the fallopian tube","isCorrect":true},{"label":"C","body":"Cervix","isCorrect":false},{"label":"D","body":"Placenta","isCorrect":false},{"label":"E","body":"Seminal vesicles","isCorrect":false}],"explanation":"Fimbriae are finger-like projections at the end of the fallopian tube that help sweep the released oocyte into the tube. The placenta forms only after implantation and pregnancy begins."},{"prompt":"Which hormone is secreted by the hypothalamus to stimulate release of LH and FSH from the anterior pituitary?","options":[{"label":"A","body":"Estrogen","isCorrect":false},{"label":"B","body":"Progesterone","isCorrect":false},{"label":"C","body":"GnRH","isCorrect":true},{"label":"D","body":"hCG","isCorrect":false},{"label":"E","body":"Inhibin","isCorrect":false}],"explanation":"GnRH (gonadotropin-releasing hormone) from the hypothalamus stimulates the anterior pituitary to release LH and FSH. Estrogen/progesterone are ovarian hormones; hCG is from early pregnancy."},{"prompt":"Which anterior pituitary hormone primarily triggers ovulation when it surges mid-cycle?","options":[{"label":"A","body":"FSH","isCorrect":false},{"label":"B","body":"LH","isCorrect":true},{"label":"C","body":"Prolactin","isCorrect":false},{"label":"D","body":"Oxytocin","isCorrect":false},{"label":"E","body":"TSH","isCorrect":false}],"explanation":"The LH surge is the key trigger for ovulation and for luteinization (formation of the corpus luteum). FSH rises too, but LH surge is the classic ovulation trigger."},{"prompt":"During most of the cycle (outside the pre-ovulatory surge), estrogen usually provides which type of feedback on GnRH/LH/FSH?","options":[{"label":"A","body":"Positive feedback (increases GnRH/LH/FSH)","isCorrect":false},{"label":"B","body":"Negative feedback (decreases GnRH/LH/FSH)","isCorrect":true},{"label":"C","body":"No feedback; estrogen does not affect the brain/pituitary","isCorrect":false},{"label":"D","body":"Only increases FSH while decreasing LH","isCorrect":false},{"label":"E","body":"Only increases GnRH while decreasing both LH and FSH","isCorrect":false}],"explanation":"At low-to-moderate levels, estrogen generally suppresses GnRH and gonadotropins (negative feedback). A key exception is sustained high estrogen late follicular phase, which flips to positive feedback and helps cause the LH surge."},{"prompt":"The LH surge is best explained by:","options":[{"label":"A","body":"A sudden drop in estrogen causing the pituitary to release LH","isCorrect":false},{"label":"B","body":"Sustained high estrogen from the dominant follicle causing positive feedback on the hypothalamus/pituitary","isCorrect":true},{"label":"C","body":"High progesterone early in the follicular phase stimulating LH release","isCorrect":false},{"label":"D","body":"Inhibin from the corpus luteum stimulating LH release","isCorrect":false},{"label":"E","body":"hCG from the placenta stimulating ovulation in non-pregnant cycles","isCorrect":false}],"explanation":"The classic trigger is sustained high estrogen late in the follicular phase, which switches from negative to positive feedback and triggers the LH surge. Progesterone is mainly high after ovulation, and hCG is relevant to pregnancy, not normal ovulatory triggering."},{"prompt":"After ovulation, the ruptured follicle becomes the corpus luteum, which mainly secretes:","options":[{"label":"A","body":"Progesterone (and some estrogen)","isCorrect":true},{"label":"B","body":"GnRH","isCorrect":false},{"label":"C","body":"FSH","isCorrect":false},{"label":"D","body":"hCG","isCorrect":false},{"label":"E","body":"Oxytocin","isCorrect":false}],"explanation":"The corpus luteum secretes progesterone (dominant) and also estrogen, maintaining the endometrium and suppressing further LH/FSH. GnRH is hypothalamic; hCG is embryonic/placental."},{"prompt":"If fertilization does NOT occur, what happens to the corpus luteum and what is the result for the uterine lining?","options":[{"label":"A","body":"Corpus luteum persists; progesterone remains high; endometrium continues secretory phase indefinitely","isCorrect":false},{"label":"B","body":"Corpus luteum degenerates; progesterone/estrogen fall; menstruation occurs","isCorrect":true},{"label":"C","body":"Corpus luteum becomes placenta immediately; progesterone rises further; menstruation occurs","isCorrect":false},{"label":"D","body":"Corpus luteum degenerates; progesterone rises; ovulation repeats within 24 hours","isCorrect":false},{"label":"E","body":"Corpus luteum persists; FSH falls to zero permanently","isCorrect":false}],"explanation":"Without pregnancy signals (notably hCG), the corpus luteum regresses, causing progesterone and estrogen to drop. That hormone withdrawal triggers shedding of the endometrium (menstruation)."},{"prompt":"Which hormone produced early in pregnancy 'rescues' the corpus luteum and keeps progesterone high?","options":[{"label":"A","body":"FSH","isCorrect":false},{"label":"B","body":"LH","isCorrect":false},{"label":"C","body":"hCG","isCorrect":true},{"label":"D","body":"Inhibin","isCorrect":false},{"label":"E","body":"ADH","isCorrect":false}],"explanation":"hCG from the early embryo/placenta supports the corpus luteum, maintaining progesterone and preventing menstruation. LH triggers ovulation but is suppressed during pregnancy."},{"prompt":"Which statement best distinguishes the ovarian cycle from the uterine cycle?","options":[{"label":"A","body":"Ovarian cycle describes changes in the endometrium; uterine cycle describes follicle development","isCorrect":false},{"label":"B","body":"Ovarian cycle describes follicle → ovulation → corpus luteum changes; uterine cycle describes endometrium changes","isCorrect":true},{"label":"C","body":"They are identical terms with identical phases","isCorrect":false},{"label":"D","body":"Ovarian cycle occurs only during pregnancy; uterine cycle occurs only at puberty","isCorrect":false},{"label":"E","body":"Uterine cycle happens in the ovary; ovarian cycle happens in the uterus","isCorrect":false}],"explanation":"The ovarian cycle is about follicles, ovulation, and corpus luteum. The uterine cycle is about the endometrium (menstrual/proliferative/secretory changes). Many students confuse the location and names."},{"prompt":"Which uterine phase is most strongly driven by estrogen and is characterized by rebuilding/thickening of the endometrium?","options":[{"label":"A","body":"Menstrual phase","isCorrect":false},{"label":"B","body":"Proliferative phase","isCorrect":true},{"label":"C","body":"Secretory phase","isCorrect":false},{"label":"D","body":"Fertilization phase","isCorrect":false},{"label":"E","body":"Implantation phase","isCorrect":false}],"explanation":"Estrogen from growing follicles stimulates the proliferative phase, rebuilding the endometrium after menstruation. The secretory phase is mainly progesterone-driven after ovulation."},{"prompt":"Which uterine phase is most strongly driven by progesterone and prepares the endometrium for possible implantation?","options":[{"label":"A","body":"Menstrual phase","isCorrect":false},{"label":"B","body":"Proliferative phase","isCorrect":false},{"label":"C","body":"Secretory phase","isCorrect":true},{"label":"D","body":"Ovulatory phase","isCorrect":false},{"label":"E","body":"Germinal phase","isCorrect":false}],"explanation":"Progesterone from the corpus luteum makes the endometrium secretory: thicker, more glandular, and nutrient-rich, supporting implantation. Menstrual and proliferative phases occur before this."},{"prompt":"Cervical mucus becomes most watery/elastic ('spinnbarkeit') around ovulation mainly due to:","options":[{"label":"A","body":"High progesterone","isCorrect":false},{"label":"B","body":"High estrogen","isCorrect":true},{"label":"C","body":"High hCG","isCorrect":false},{"label":"D","body":"High prolactin","isCorrect":false},{"label":"E","body":"High oxytocin","isCorrect":false}],"explanation":"Estrogen makes cervical mucus thinner and more sperm-friendly near ovulation. Progesterone thickens mucus in the luteal phase, which is a common confusion trap."},{"prompt":"After ovulation, cervical mucus typically becomes thicker mainly due to:","options":[{"label":"A","body":"Progesterone from the corpus luteum","isCorrect":true},{"label":"B","body":"FSH from the pituitary","isCorrect":false},{"label":"C","body":"hCG from the placenta","isCorrect":false},{"label":"D","body":"A sudden rise in GnRH","isCorrect":false},{"label":"E","body":"A sudden loss of ovarian hormones","isCorrect":false}],"explanation":"Progesterone in the luteal phase thickens cervical mucus, making it less permeable to sperm. Estrogen tends to thin mucus pre-ovulation."},{"prompt":"Basal body temperature often rises slightly AFTER ovulation because:","options":[{"label":"A","body":"Estrogen peaks and directly raises temperature","isCorrect":false},{"label":"B","body":"Progesterone has a thermogenic effect during the luteal phase","isCorrect":true},{"label":"C","body":"FSH surge increases metabolism permanently","isCorrect":false},{"label":"D","body":"hCG is released in every cycle regardless of pregnancy","isCorrect":false},{"label":"E","body":"The endometrium releases heat when it sheds","isCorrect":false}],"explanation":"Progesterone produced after ovulation raises basal body temperature slightly, which is why temperature tracking can help estimate ovulation timing. Estrogen peaks before ovulation, not after."},{"prompt":"A key difference between oogenesis and spermatogenesis is that oogenesis usually results in:","options":[{"label":"A","body":"Four equal-sized functional gametes from each primary oocyte","isCorrect":false},{"label":"B","body":"One large ovum and polar bodies due to unequal cytokinesis","isCorrect":true},{"label":"C","body":"Two functional gametes from each primary oocyte with equal cytoplasm","isCorrect":false},{"label":"D","body":"No meiosis because females are born with haploid eggs","isCorrect":false},{"label":"E","body":"Only mitosis; meiosis does not occur in females","isCorrect":false}],"explanation":"Oogenesis produces one large cell optimized for early development, while polar bodies discard extra chromosomes. Spermatogenesis produces four smaller functional sperm. The unequal division is the key conceptual trap."}]}"
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