Reproductive System — MCQs
A female patient presents with hirsutism, amenorrhea, and obesity. What is the most likely diagnosis?
In the transition from a Graafian follicle to a functional corpus luteum, which of the following cellular events occurs?
What is the primary reason for infertility in Sertoli cell only syndrome?
Which of the following structures has the function of capacitation?
A 29 year old female presented with infertility. There is history of abdominal pain, dyspareunia, dysmenorrhea, menorrhagia. Most likely cause:
What is the duration of embryogenesis in human development?
Blood testis barrier in testis is formed by?
Remnants of Wolffian ducts in a female are found in
Which artery supplies the ductus deferens?
The coracoid process is a type of epiphysis that is:
Reproductive System Indian Medical PG Practice Questions and MCQs
Question 1: A female patient presents with hirsutism, amenorrhea, and obesity. What is the most likely diagnosis?
- A. Androgen-secreting ovarian tumor
- B. Congenital adrenal hyperplasia
- C. Cushing's syndrome
- D. Polycystic Ovary Syndrome (PCOS) (Correct Answer)
Explanation: ***Polycystic Ovary Syndrome (PCOS)*** - **Hirsutism**, **amenorrhea** (or oligomenorrhea), and **obesity** are classic clinical features of PCOS, reflecting hyperandrogenism and insulin resistance [2]. - PCOS is a diagnosis of exclusion and involves chronic anovulation and polycystic ovaries on ultrasound [3], though these are not explicitly mentioned, the constellation of symptoms strongly points to it. *Androgen-secreting ovarian tumor* - While it can cause **hirsutism** and **amenorrhea**, the onset is typically **rapid** and severe, with very high androgen levels, and obesity is not a primary feature. - Ovarian tumors are generally less common than PCOS and may present with a palpable mass or specific imaging findings. *Congenital adrenal hyperplasia* - This genetic condition often presents in childhood or adolescence with varying degrees of **virilization** and menstrual irregularities due to enzyme deficiencies in cortisol synthesis [1]. - While it causes **hirsutism** and potentially **amenorrhea**, obesity is not a direct consequence, and the patient's age of presentation and specific symptom pattern are less typical for adult-onset CAH in this context. *Cushing's syndrome* - Characterized by **central obesity**, **moon facies**, **buffalo hump**, **striae**, and proximal muscle weakness due to chronic glucocorticoid excess. - Although it can cause **menstrual irregularities** and mild **hirsutism** [2], the overall clinical picture including the absence of other specific Cushingoid features makes it less likely than PCOS.
Question 2: In the transition from a Graafian follicle to a functional corpus luteum, which of the following cellular events occurs?
- A. Granulosa cells begin to express estrogen receptors
- B. Granulosa cells begin to express LH receptors (Correct Answer)
- C. Theca cells begin to express androgen receptors
- D. Granulosa cells begin to express progesterone receptors
Explanation: ***Granulosa cells begin to express LH receptors*** - During the late follicular phase, under **FSH** stimulation, **granulosa cells** in the developing Graafian follicle acquire **LH receptors**. - This acquisition of LH receptors is essential for the transition to a corpus luteum, as it enables the **LH surge** to trigger ovulation and subsequently stimulate **luteinization** and **progesterone production** by the corpus luteum. - While the initial expression occurs before ovulation, the functional significance becomes apparent during the transformation to the corpus luteum, making this the most critical receptor-related event in this transition among the given options. *Granulosa cells begin to express estrogen receptors* - Granulosa cells already express **estrogen receptors** in early follicular stages, which are essential for their proliferation and **aromatase synthesis**. - Estrogen receptor expression is characteristic of developing follicles throughout folliculogenesis, not specifically associated with corpus luteum formation. *Theca cells begin to express androgen receptors* - **Theca cells** produce **androgen precursors** (androstenedione, testosterone) under LH stimulation during the follicular phase, which granulosa cells convert to estrogen. - While theca cells contribute to the corpus luteum (theca-lutein cells), androgen receptor expression is not the primary defining cellular event of this transition. *Granulosa cells begin to express progesterone receptors* - The corpus luteum is the major source of **progesterone** in the luteal phase, but granulosa cells do not significantly upregulate progesterone receptors as part of their luteinization. - The key functional change is the cells' ability to *produce* large amounts of progesterone in response to LH, not increased progesterone receptor expression.
Question 3: What is the primary reason for infertility in Sertoli cell only syndrome?
- A. Too many Sertoli cells inhibit spermatogenesis via inhibin
- B. Proper blood-testis barrier is not established
- C. Sufficient numbers of spermatozoa are not produced
- D. The absence of germ cells in this condition. (Correct Answer)
Explanation: ***The absence of germ cells in this condition.*** - **Sertoli cell only syndrome** is characterized by the complete or near-complete absence of germ cells in the seminiferous tubules [2]. - Since germ cells are the precursors to spermatozoa, their absence directly results in the inability to produce sperm, leading to **infertility** [1]. *Too many Sertoli cells inhibit spermatogenesis via inhibin* - While Sertoli cells produce **inhibin B**, which negatively regulates FSH, the primary issue in Sertoli cell only syndrome is the lack of germ cells, not an overabundance of Sertoli cells or excessive inhibin production causing inhibition [1]. - The syndrome is defined by the *absence of germ cells*, not by a functional alteration of Sertoli cells due to their quantity. *Proper blood-testis barrier is not established* - The **blood-testis barrier (BTB)** is formed by tight junctions between Sertoli cells and is crucial for creating an immunological barrier for developing germ cells [2]. - While disruptions in BTB integrity can impair spermatogenesis, the primary cause of infertility in Sertoli cell only syndrome is the *absence of the cells that the barrier is meant to protect* (germ cells), rather than a failure of the barrier itself. *Sufficient numbers of spermatozoa are not produced* - This statement is true as a *result* of infertility, but it does not explain the *primary reason* for it. - The lack of spermatozoa is a direct consequence of the **absence of germ cells**, which are necessary precursors for sperm production [1].
Question 4: Which of the following structures has the function of capacitation?
- A. Male reproductive tract
- B. Vas deferens
- C. Female reproductive tract (Correct Answer)
- D. Capillary
Explanation: ***Female reproductive tract*** - **Capacitation** is a biochemical process that occurs in the **female reproductive tract** (primarily the fallopian tubes and uterus), enabling sperm to gain the ability to fertilize an egg. - This process involves the removal of **cholesterol and glycoproteins** from the sperm head membrane, which modifies its motility and prepares it for the **acrosome reaction**. - Capacitation typically takes **5-6 hours** and is essential for successful fertilization. *Male reproductive tract* - The male reproductive tract produces and stores sperm, but it is **not the site where capacitation occurs**. - Sperm are immature and unable to fertilize an egg when they leave the male reproductive tract. - Sperm only gain fertilizing capacity after exposure to the female reproductive tract environment. *Vas deferens* - The vas deferens is a tube that transports sperm from the epididymis to the ejaculatory duct. - It is a part of the male reproductive tract and does **not contribute to capacitation**. *Capillary* - Capillaries are tiny blood vessels involved in nutrient and waste exchange, entirely unrelated to sperm function or capacitation. - This option is biologically implausible in the context of reproduction.
Question 5: A 29 year old female presented with infertility. There is history of abdominal pain, dyspareunia, dysmenorrhea, menorrhagia. Most likely cause:
- A. Adenomyosis
- B. Endometriosis (Correct Answer)
- C. Cervicitis
- D. Myomas
Explanation: ***Endometriosis*** - The classic triad of symptoms in this 29-year-old female—**dysmenorrhea**, **dyspareunia**, and **infertility**—is highly suggestive of endometriosis. - **Ectopic endometrial tissue** can cause chronic abdominal pain, menorrhagia, and inflammation, contributing to infertility. *Adenomyosis* - This condition involves the presence of **endometrial tissue within the myometrium**, leading to a thickened uterine wall. - While it can cause dysmenorrhea and menorrhagia, **infertility** is not its primary presentation, and it is less commonly associated with severe dyspareunia compared to endometriosis. *Cervicitis* - **Inflammation of the cervix** typically presents with vaginal discharge, post-coital bleeding, or pelvic pain. - It is not a common cause of primary infertility, severe dysmenorrhea, or dyspareunia as described. *Myomas* - Uterine **fibroids (leiomyomas)** are benign tumors that can cause heavy menstrual bleeding (menorrhagia), pelvic pressure, and sometimes infertility. - However, they are less commonly associated with the triad of severe dysmenorrhea and dyspareunia as prominently as seen in endometriosis.
Question 6: What is the duration of embryogenesis in human development?
- A. From fertilization to the twelfth week
- B. From the second week to the eighth week
- C. From fertilization to the tenth week
- D. From fertilization to the eighth week (Correct Answer)
Explanation: ***From fertilization to the eighth week*** - **Embryogenesis** is the period during which the major **organ systems develop** [1]. - This critical phase begins at **fertilization** and extends through approximately the **eighth week of gestation** [1]. - The eighth week marks the end of the embryonic period, after which the **fetal period** begins [2]. *From the second week to the eighth week* - This period correctly identifies the **end of embryogenesis** but incorrectly states the **beginning**. - The first week post-fertilization involves **cleavage, morula, and blastocyst formation**, which are essential initial steps of embryonic development. - Excluding the first week misses critical early embryonic events. *From fertilization to the tenth week* - This duration is **too long** for embryogenesis, as the **ninth week marks the beginning of the fetal period** [1], [2]. - The fetal period is characterized by **growth and maturation** of already formed organ systems rather than organogenesis [2]. *From fertilization to the twelfth week* - This period is also **too long** for embryogenesis, encompassing a significant portion of the **fetal period**. - By the twelfth week, most major structures are already established and are undergoing further **development and growth**, not organogenesis.
Question 7: Blood testis barrier in testis is formed by?
- A. Germ cells
- B. Sertoli cells (Correct Answer)
- C. Leydig cells
- D. Granulosa cells
Explanation: ***Sertoli cells*** - **Sertoli cells** form tight junctions with each other, creating the **blood-testis barrier** [1] - This barrier divides the seminiferous epithelium into **basal and adluminal compartments** [1] - Essential for protecting developing **germ cells** from immune attack and maintaining a specialized microenvironment for **spermatogenesis** [1] - The tight junctions between Sertoli cells are among the tightest in the human body *Granulosa cells* - **Granulosa cells** are found in the **ovary**, not the testis - They surround the oocyte in ovarian follicles and produce **estrogen** - Completely unrelated to testicular structure or function *Germ cells* - **Germ cells** (spermatogonia, spermatocytes, spermatids, spermatozoa) are the developing sperm cells [1] - They are **protected by** the blood-testis barrier, not forming it [1] - Located within the seminiferous tubules but do not create barrier structures [1] *Leydig cells* - **Leydig cells** are interstitial cells located in the connective tissue **between seminiferous tubules** - Their primary function is production of **testosterone**, not forming barriers [2] - They are outside the seminiferous tubules and not involved in barrier formation [2]
Question 8: Remnants of Wolffian ducts in a female are found in
- A. Broad ligament (Correct Answer)
- B. Uterovesical pouch
- C. Pouch of Douglas
- D. Iliac fossa
Explanation: ***Broad ligament*** - In females, remnants of the **Wolffian (mesonephric) ducts** can persist as structures such as the **epoophoron**, **paroophoron**, and **Gartner's duct cysts**, which are typically found within the broad ligament [1]. - The **broad ligament** is a fold of peritoneum that extends from the lateral walls of the uterus to the sidewalls of the pelvis, enclosing these developmental remnants. *Uterovesical pouch* - This is a peritoneal reflection between the **uterus and the bladder** and does not typically contain remnants of the Wolffian ducts. - It is a common site for fluid accumulation but not for developmental anomalies related to the mesonephric system. *Pouch of Douglas* - Also known as the **recto-uterine pouch**, this is the most dependent part of the peritoneal cavity in females, located between the **uterus and the rectum**. - While it can accumulate fluid or pathology, it is not where Wolffian duct remnants are primarily located. *Iliac fossa* - The **iliac fossa** contains structures like the **iliacus muscle**, **lymph nodes**, and parts of the bowel, but it is not the anatomical location for the remnants of the Wolffian ducts in females. - This region is more involved in supporting abdominal contents and housing major blood vessels and nerves rather than reproductive developmental remnants.
Question 9: Which artery supplies the ductus deferens?
- A. Deferential artery (Correct Answer)
- B. Cremasteric artery
- C. Inferior epigastric artery
- D. Vesical artery
Explanation: ***Deferential artery*** - The **deferential artery** is the primary blood supply to the **ductus deferens**. It typically originates from the **superior or inferior vesical artery**. - This artery runs alongside the ductus deferens within the **spermatic cord**, providing arterial branches throughout its length. *Cremasteric artery* - The **cremasteric artery** primarily supplies the **cremaster muscle** and the fascial coverings of the spermatic cord [1]. - While it traverses the spermatic cord, it does not directly supply the ductus deferens itself. *Inferior epigastric artery* - The **inferior epigastric artery** supplies the **anterior abdominal wall muscles** and skin [1]. - It does not directly supply the ductus deferens but gives rise to the **cremasteric artery** as one of its branches [1]. *Vesical artery* - The **vesical arteries** (superior and inferior) primarily supply the **urinary bladder**. - While the deferential artery often originates from a vesical artery, "vesical artery" itself is not the direct and specific supply to the ductus deferens.
Question 10: The coracoid process is a type of epiphysis that is:
- A. Atavistic (Correct Answer)
- B. Pressure
- C. Traction
- D. Aberrant
Explanation: ### Explanation The **coracoid process** of the scapula is a classic example of an **atavistic epiphysis**. In human anatomy, epiphyses are classified based on their functional and evolutionary characteristics. **1. Why "Atavistic" is Correct:** An atavistic epiphysis represents a bone that was once an independent element in lower vertebrates (phylogenetically) but has become fused to another bone in humans. In birds and reptiles, the coracoid is a separate, major bone of the pectoral girdle. In humans, it has lost its independence and exists merely as a process that fuses with the scapula. **2. Analysis of Incorrect Options:** * **Pressure Epiphysis:** These are found at the ends of long bones and are weight-bearing or transmit pressure across a joint (e.g., Head of the femur, Lower end of the radius). * **Traction Epiphysis:** These develop due to the "tug" or pull of tendons or muscles. They do not take part in joint formation (e.g., Greater and lesser trochanters of the femur, Tubercles of the humerus). * **Aberrant Epiphysis:** These are deviations from the norm and are not always present (e.g., Epiphysis at the head of the first metacarpal or the base of other metacarpals). **3. NEET-PG High-Yield Pearls:** * **OS Coxae:** The **os acetabuli** (the bone that forms the floor of the acetabulum) is another example of an atavistic epiphysis. * **Coracoid Ossification:** It develops from two primary centers and one secondary center. Most bones in the fetus are modeled in cartilage before enchondral ossification [1]. * **Clinical Significance:** The coracoid process serves as the origin for the short head of the biceps brachii and coracobrachialis, and the insertion for the pectoralis minor. It is often referred to as the "Surgeon's Lighthouse" because it serves as a landmark for avoiding the brachial plexus during shoulder surgery.
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