Reproductive physiology (menstrual cycle, pregnancy) US Medical PG Practice Questions and MCQs
Practice US Medical PG questions for Reproductive physiology (menstrual cycle, pregnancy). These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Reproductive physiology (menstrual cycle, pregnancy) US Medical PG Question 1: A 26-year-old woman comes to the emergency department because of a 3-day history of nausea and vomiting. Her last menstrual period was 9 weeks ago. A urine pregnancy test is positive. Ultrasonography shows an intrauterine pregnancy consistent in size with a 7-week gestation. The hormone that was measured in this patient's urine to detect the pregnancy is also directly responsible for which of the following processes?
- A. Development of breast tissue
- B. Preparation of the uterine endometrium for implantation
- C. Inhibition of preterm uterine contractions
- D. Maintenance of the corpus luteum (Correct Answer)
- E. Inhibition of ovulation
Reproductive physiology (menstrual cycle, pregnancy) Explanation: ***Maintenance of the corpus luteum***
- The hormone measured in the urine pregnancy test is **human chorionic gonadotropin (hCG)**.
- **hCG** acts like **luteinizing hormone (LH)** to maintain the **corpus luteum** in early pregnancy, ensuring continued progesterone production until the placenta takes over.
*Development of breast tissue*
- **Estrogen** and **progesterone** are the primary hormones responsible for the development of breast tissue during pregnancy, preparing the breasts for lactation.
- While hCG indirectly supports these hormones, it does not directly cause breast tissue development.
*Preparation of the uterine endometrium for implantation*
- The **preparation of the uterine endometrium** for implantation is primarily driven by **progesterone**, produced by the corpus luteum initially and later by the placenta.
- hCG’s role is to maintain the corpus luteum, thus indirectly supporting progesterone production.
*Inhibition of preterm uterine contractions*
- **Progesterone** is the main hormone responsible for **inhibiting uterine contractions** during pregnancy to prevent preterm labor.
- While hCG supports progesterone production, it does not directly inhibit uterine contractions itself.
*Inhibition of ovulation*
- High levels of **estrogen** and **progesterone** during pregnancy suppress the hypothalamic-pituitary-gonadal axis, thereby **inhibiting ovulation**.
- While hCG maintains the corpus luteum which produces these hormones, hCG itself is not the direct inhibitor of ovulation.
Reproductive physiology (menstrual cycle, pregnancy) US Medical PG Question 2: A scientist in Chicago is studying a new blood test to detect Ab to EBV with increased sensitivity and specificity. So far, her best attempt at creating such an exam reached 82% sensitivity and 88% specificity. She is hoping to increase these numbers by at least 2 percent for each value. After several years of work, she believes that she has actually managed to reach a sensitivity and specificity much greater than what she had originally hoped for. She travels to China to begin testing her newest blood test. She finds 2,000 patients who are willing to participate in her study. Of the 2,000 patients, 1,200 of them are known to be infected with EBV. The scientist tests these 1,200 patients' blood and finds that only 120 of them tested negative with her new exam. Of the patients who are known to be EBV-free, only 20 of them tested positive. Given these results, which of the following correlates with the exam's specificity?
- A. 82%
- B. 90%
- C. 84%
- D. 86%
- E. 98% (Correct Answer)
Reproductive physiology (menstrual cycle, pregnancy) Explanation: ***98%***
- **Specificity** measures the proportion of **true negatives** among all actual negatives.
- In this case, 800 patients are known to be EBV-free (actual negatives), and 20 of them tested positive (false positives). This means 800 - 20 = 780 tested negative (true negatives). Specificity = (780 / 800) * 100% = **98%**.
*82%*
- This value represents the *original sensitivity* before the scientist’s new attempts to improve the test.
- It does not reflect the *newly calculated specificity* based on the provided data.
*90%*
- This value represents the *newly calculated sensitivity* of the test, not the specificity.
- Out of 1200 EBV-infected patients, 120 tested negative (false negatives), meaning 1080 tested positive (true positives). Sensitivity = (1080 / 1200) * 100% = 90%.
*84%*
- This percentage is not directly derived from the information given for either sensitivity or specificity after the new test results.
- It does not correspond to any of the calculated values for the new test's performance.
*86%*
- This percentage is not directly derived from the information given for either sensitivity or specificity after the new test results.
- It does not correspond to any of the calculated values for the new test's performance.
Reproductive physiology (menstrual cycle, pregnancy) US Medical PG Question 3: A 15-year-old female presents to her family physician for an annual school physical exam and check-up. She is accompanied by her mother to the visit and is present in the exam room. The patient has no complaints, and she does not have any past medical problems. She takes no medications. The patient reports that she remains active, exercising 5 times a week, and eats a healthy and varied diet. Which of the following would be the best way for the physician to obtain a more in-depth social history, including sexual history and use of alcohol, tobacco, or recreational drugs?
- A. Disallow the mother to be present in the examination room throughout the entirety of the visit
- B. Give the patient a social history questionnaire to fill out in the exam room
- C. Ask the mother to step outside into the hall for a portion of the visit (Correct Answer)
- D. Ask the patient the questions directly, with her mother still in the exam room
- E. Speak softly to the patient so that the mother does not hear and the patient is not embarrassed
Reproductive physiology (menstrual cycle, pregnancy) Explanation: ***Ask the mother to step outside into the hall for a portion of the visit***
- This approach allows the physician to speak with the adolescent **privately and confidentially**, which is crucial for obtaining sensitive information such as sexual history, drug use, and mental health concerns.
- Adolescents are more likely to disclose personal information when their parents are not present, fostering trust and ensuring **comprehensive history-taking** vital for their well-being.
*Disallow the mother to be present in the examination room throughout the entirety of the visit*
- This is an **overly restrictive** approach that might create tension or distrust between the physician, patient, and parent, especially at the start of the visit.
- While privacy is essential for sensitive topics, parental presence can be valuable for discussing general health, family history, and **treatment plans**, especially for younger adolescents.
*Give the patient a social history questionnaire to fill out in the exam room*
- While questionnaires can be useful for gathering basic information, they often **lack the nuance** of a direct conversation and may not prompt the patient to elaborate on sensitive issues.
- Furthermore, having the mother present while the patient fills out a questionnaire on sensitive topics still **compromises confidentiality** and may lead to incomplete or dishonest answers.
*Ask the patient the questions directly, with her mother still in the exam room*
- Asking sensitive questions with a parent present is **unlikely to yield truthful and complete answers**, as adolescents may feel embarrassed, judged, or fear parental disapproval.
- This approach compromises the **confidentiality** that is fundamental to building trust with adolescent patients.
*Speak softly to the patient so that the mother does not hear and the patient is not embarrassed*
- Speaking softly is **unprofessional** and still does not guarantee privacy, as the mother might still overhear parts of the conversation.
- This method also **fails to establish true confidentiality**, which is central to building rapport and encouraging open communication with adolescent patients about sensitive topics.
Reproductive physiology (menstrual cycle, pregnancy) US Medical PG Question 4: A 24-year-old woman comes to the physician for preconceptional advice. She has been married for 2 years and would like to conceive within the next year. Menses occur at regular 30-day intervals and last 4 days with normal flow. She does not smoke or drink alcohol and follows a balanced diet. She takes no medications. She is 160 cm (5 ft 3 in) tall and weighs 55 kg (121 lb); BMI is 21.5 kg/m2. Physical examination, including pelvic examination, shows no abnormalities. She has adequate knowledge of the fertile days of her menstrual cycle. Which of the following is most appropriate recommendation for this patient at this time?
- A. Begin high-dose vitamin A supplementation
- B. Begin vitamin B12 supplementation
- C. Begin folate supplementation (Correct Answer)
- D. Begin iron supplementation
- E. Gain 2 kg prior to conception
Reproductive physiology (menstrual cycle, pregnancy) Explanation: ***Begin folate supplementation***
- **Folate supplementation** of 400 mcg daily is recommended for all women of childbearing age to reduce the risk of **neural tube defects** (NTDs) in the fetus. This should ideally begin at least one month before conception and continue through the first trimester.
- The patient is planning to conceive, making preemptive folate supplementation critical for preventing serious birth defects.
*Begin high-dose vitamin A supplementation*
- **High-dose vitamin A** (more than 10,000 IU/day) can be **teratogenic** and is therefore contraindicated during preconception and pregnancy.
- While vitamin A is essential for fetal development, excessive amounts can lead to fetal abnormalities.
*Begin vitamin B12 supplementation*
- **Vitamin B12 supplementation** is generally not necessary unless the patient has a diagnosed deficiency, such as in strict vegetarians or those with malabsorption issues.
- There is no indication of B12 deficiency in this patient's history or presentation.
*Begin iron supplementation*
- Routine **iron supplementation** is not recommended preconception unless the patient is diagnosed with **iron deficiency anemia**.
- Excessive iron intake without a clear indication can cause gastrointestinal upset and has not been shown to improve pregnancy outcomes in non-anemic women.
*Gain 2 kg prior to conception*
- The patient has a **healthy BMI of 21.5 kg/m2**, which is within the normal range (18.5-24.9 kg/m2).
- There is no medical indication for her to gain weight prior to conception.
Reproductive physiology (menstrual cycle, pregnancy) US Medical PG Question 5: A newborn infant with karyotype 46, XY has male internal and external reproductive structures. The lack of a uterus in this infant can be attributed to the actions of which of the following cell types?
- A. Granulosa
- B. Theca
- C. Leydig
- D. Reticularis
- E. Sertoli (Correct Answer)
Reproductive physiology (menstrual cycle, pregnancy) Explanation: ***Sertoli***
- **Sertoli cells** in the fetal testis produce **Anti-Müllerian Hormone (AMH)**, which is crucial for the regression of the **Müllerian ducts**.
- The **Müllerian ducts** (also called paramesonephric ducts) would otherwise develop into the uterus, fallopian tubes, and upper vagina in the female fetus. In a male fetus, AMH from Sertoli cells causes these structures to degenerate, leading to the absence of a uterus.
*Granulosa*
- **Granulosa cells** are found in the ovarian follicles of females and are involved in **estrogen synthesis** and support of oocyte development.
- They do not play a role in Müllerian duct regression; in fact, the absence of AMH in female fetuses allows the Müllerian ducts to develop.
*Theca*
- **Theca cells** are also found in the ovarian follicles and are responsible for producing **androgens** (which are then converted to estrogen by granulosa cells).
- Like granulosa cells, theca cells are involved in ovarian function and estrogen production, not in the regression of Müllerian ducts.
*Leydig*
- **Leydig cells** are located in the interstitium of the testes and are responsible for producing **androgens** (primarily testosterone) in response to luteinizing hormone (LH).
- Testosterone from Leydig cells promotes the development of the **Wolffian ducts** (which form male internal reproductive structures like the epididymis, vas deferens, and seminal vesicles), but it does not directly cause the regression of the Müllerian ducts.
*Reticularis*
- The **zona reticularis** is the innermost layer of the adrenal cortex and produces **adrenal androgens**.
- While adrenal androgens play a role in puberty and certain endocrine conditions, they are not involved in the differentiation of fetal reproductive tracts or the regression of Müllerian ducts.
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