Male Reproduction Quiz PDF

#### Section 1: Components of Sexual Differentiation 1. **What is the primary function of the testes in males?** - A) Produce ova - B) Produce sperm and secrete testosterone - C) Secrete estrogen - D) Regulate body temperature - **Answer:** B 2. **What structures are included in the inte...

#### Section 1: Components of Sexual Differentiation 1. **What is the primary function of the testes in males?** - A) Produce ova - B) Produce sperm and secrete testosterone - C) Secrete estrogen - D) Regulate body temperature - **Answer:** B 2. **What structures are included in the internal genital tract of males?** - A) Penis and scrotum - B) Epididymis, vas deferens, seminal vesicles, and prostate - C) Ovaries and fallopian tubes - D) Labia majora and labia minora - **Answer:** B 3. **Which structures are considered external genitalia in females?** - A) Penis and scrotum - B) Epididymis and vas deferens - C) Labia majora, labia minora, clitoris, and vestibule - D) Seminal vesicles and prostate - **Answer:** C #### Section 2: Definitions 4. **What determines genetic sex?** - A) Presence of gonads - B) Physical characteristics of the external genitalia - C) Sex chromosomes (XY for males and XX for females) - D) Levels of sex hormones - **Answer:** C 5. **Gonadal sex is determined by the presence of:** - A) Estrogen and progesterone - B) Testes in males and ovaries in females - C) External genitalia - D) GnRH secretion - **Answer:** B 6. **Phenotypic sex is influenced by:** - A) Sex chromosomes - B) Hormonal output from the gonads (testosterone in males and estrogen in females) - C) Presence of gonads - D) Levels of GnRH - **Answer:** B #### Section 3: Genetic Sex 7. **During the first 5 weeks of gestational life, the gonads are:** - A) Male-specific  - B) Female-specific - C) Indifferent or bipotential - D) Fully developed - **Answer:** C 8. **At what gestational age do the testes begin to develop in genetic males?** - A) Week 3 - B) Week 6 to 7 - C) Week 9 - D) Week 12 - **Answer:** B 9. **At what gestational age do the ovaries begin to develop in genetic females?** - A) Week 3 - B) Week 6 to 7 - C) Week 9 - D) Week 12 - **Answer:** C #### Section 4: Gonadal Sex 10. **What structures determine gonadal sex?** - A) Estrogen levels - B) External genitalia - C) Presence of testes in males and ovaries in females - D) GnRH secretion  - **Answer:** C 11. **In males, what are the germ cells and steroid hormone-secreting cells?** - A) Oogonia and theca cells - B) Spermatogonia and Leydig cells - C) Oogonia and granulosa cells - D) Spermatogonia and theca cells - **Answer:** B #### Section 5: Phenotypic Sex 12. **What structures determine phenotypic sex?** - A) Sex chromosomes - B) Development of the internal genital tract and external genitalia - C) Presence of gonads - D) Levels of GnRH - **Answer:** B 13. **Which hormone stimulates the growth and differentiation of the Wolffian ducts?** - A) Estrogen - B) Anti-Müllerian hormone (AMH) - C) Progesterone - D) Testosterone - **Answer:** D 14. **What hormone causes atrophy of the Müllerian ducts?**  - A) Estrogen - B) Anti-Müllerian hormone (AMH) - C) Progesterone - D) Testosterone - **Answer:** B 15. **The Wolffian ducts give rise to which structures in males?** - A) Fallopian tubes and uterus - B) Epididymis, vas deferens, seminal vesicles, and ejaculatory ducts - C) Labia majora and labia minora - D) Ovaries and cervix - **Answer:** B #### Section 6: Gonadotropin Secretion and the Hypothalamic-Pituitary Axis 16. **What hormone is secreted by the hypothalamus to regulate reproductive function?** - A) FSH - B) LH - C) GnRH - D) Testosterone - **Answer:** C 17. **What hormones are secreted by the anterior pituitary in response to GnRH?** - A) Estrogen and progesterone - B) FSH and LH - C) Testosterone and inhibin  - D) Anti-Müllerian hormone and estradiol - **Answer:** B 18. **Which cells in the testes are stimulated by LH to produce testosterone?** - A) Sertoli cells - B) Spermatogonia - C) Leydig cells - D) Granulosa cells - **Answer:** C #### Section 7: Components of the Male Reproductive System 19. **Which hormones are required for the development of the male phenotype?** - A) Estrogen and progesterone - B) Testosterone and Anti-Müllerian Hormone (AMH) - C) FSH and LH - D) GnRH and inhibin - **Answer:** B 20. **What is the function of the epididymis?** - A) Produce sperm - B) Store and mature sperm - C) Transport sperm during ejaculation - D) Produce seminal fluid - **Answer:** B 21. **What is the role of the seminal vesicles in the male reproductive system?** - A) Produce sperm - B) Store sperm - C) Produce seminal fluid to nourish and transport sperm - D) Secrete testosterone - **Answer:** C #### Section 8: Structure of the Testes 22. **Why do the testes reside outside the abdominal cavity in the scrotum?** - A) To protect them from injury - B) To maintain a temperature slightly lower than body temperature, which is optimal for sperm development and maturation - C) To facilitate testosterone production - D) To enhance blood flow - **Answer:** B #### Section 9: Seminiferous Tubules 23. **What is the primary function of the seminiferous tubules?** - A) Secrete testosterone - B) Produce seminal fluid - C) Germination, maturation, and transportation of sperm cells - D) Maintain the blood-testis barrier - **Answer:** C #### Section 10: Intratubular Compartment 24. **What cells are found inside the seminiferous tubules and provide support to developing sperm cells?** - A) Leydig cells - B) Theca cells - C) Sertoli cells - D) Spermatogonia - **Answer:** C #### Section 11: Peritubular Compartment 25. **What is the role of Leydig cells in the testes?** - A) Support developing sperm cells - B) Produce testosterone - C) Maintain the blood-testis barrier - D) Secrete inhibin - **Answer:** B #### Section 12: Role of the Sertoli Cells 26. **What is the function of the blood-testis barrier?** - A) Concentrate testosterone - B) Prevent the immune system from attacking developing sperm cells - C) Secrete inhibin - D) Guide sperm cells toward the lumen  - **Answer:** B 27. **What hormone do Sertoli cells secrete to inhibit FSH production?** - A) Testosterone - B) Anti-Müllerian hormone (AMH) - C) Inhibin - D) GnRH - **Answer:** C 28. **Why are Sertoli cells referred to as 'nurse cells'?** - A) They produce testosterone - B) They provide structural and nutritional support to developing sperm cells - C) They maintain the blood-testis barrier - D) They secrete inhibin - **Answer:** B 29. **What protein do Sertoli cells produce to concentrate testosterone within the seminiferous tubules?** - A) FSH - B) LH - C) Androgen-binding protein (ABP) - D) Inhibin - **Answer:** C 30. **What hormone do Sertoli cells secrete during embryonic development to prevent the formation of female reproductive structures?** - A) Testosterone  - B) Estrogen - C) Anti-Müllerian hormone (AMH) - D) Inhibin - **Answer:** C #### Section 13: Hypothalamic-Pituitary Axis 31. **Which hormone stimulates Leydig cells to produce testosterone?** - A) FSH - B) LH - C) GnRH - D) Inhibin - **Answer:** B 32. **What is the role of GnRH in the hypothalamic-pituitary axis?** - A) Stimulate the production of inhibin - B) Stimulate the anterior pituitary to secrete FSH and LH - C) Inhibit testosterone production - D) Maintain the blood-testis barrier - **Answer:** B #### Section 14: Androgens 33. **What enzyme converts testosterone to dihydrotestosterone (DHT)?** - A) Aromatase - B) 5-alpha-reductase  - C) LH - D) FSH - **Answer:** B 34. **What is the role of sex hormone-binding globulin (SHBG)?** - A) Bind to sex hormones like testosterone, regulating their bioavailability and transport in the bloodstream - B) Convert testosterone to estradiol - C) Inhibit FSH production - D) Maintain the blood-testis barrier - **Answer:** A 35. **Which hormone is converted to estradiol by the enzyme aromatase?** - A) Testosterone - B) Dihydrotestosterone (DHT) - C) Progesterone - D) Inhibin - **Answer:** A #### Section 15: Androgen Actions 36. **Which androgen is responsible for inducing and maintaining secondary sex characteristics in males?** - A) Estradiol - B) Progesterone - C) Testosterone - D) Inhibin  - **Answer:** C 37. **What are the effects of dihydrotestosterone (DHT) at puberty in males?** - A) Development of female reproductive structures - B) Inducing and maintaining secondary sex characteristics, such as facial and body hair, deepening of the voice, and development of the prostate and seminal vesicles - C) Inhibiting spermatogenesis - D) Decreasing muscle mass - **Answer:** B #### Section 16: Actions of 17 Beta-estradiol 38. **What is the role of 17 beta-estradiol in mature sperm cells?** - A) Inhibit spermatogenesis - B) Optimize spermatogenesis and sperm function - C) Convert to testosterone - D) Maintain the blood-testis barrier - **Answer:** B #### Section 17: Male Reproductive Tract 39. **Which structures are part of the male reproductive tract?** - A) Epididymis, vas deferens, ejaculatory duct, urethra, and distal urinary tract - B) Ovaries and fallopian tubes - C) Labia majora and labia minora - D) Uterus and cervix  - **Answer:** A #### Section 18: Male Sexual Act 40. **Which nervous system is primarily active during erection?** - A) Sympathetic nervous system - B) Parasympathetic nervous system - C) Central nervous system - D) Peripheral nervous system - **Answer:** B 41. **Which phase of the male sexual act is controlled by the sympathetic nervous system?** - A) Erection - B) Emission and ejaculation - C) Arousal - D) Resolution - **Answer:** B These questions cover key concepts from the study guide, providing a comprehensive review suitable for a multiple-choice practice exam.