Quick Revision Notes & MCQs: Human Reproductive System for GPAT, NIPER, AIIMS Pharmacist, Railway Pharmacist, SSC, ESIC, and State Pharmacist Exams

1. Male Reproductive System

The male reproductive system consists of:

• Primary sex organ: Testes

• Accessory ducts: Rete testis, vasa efferentia, epididymis, vas deferens, ejaculatory duct, urethra

• Accessory glands: Seminal vesicles, prostate gland, bulbourethral glands

• External genitalia: Penis and scrotum

Functions

• Production of sperm (spermatogenesis)

• Secretion of testosterone

• Transport and delivery of sperm during ejaculation

Important Facts

• Seminal vesicles contribute about 60–70% of semen volume.

• Prostate gland contributes about 20–30% of semen volume.

• Bulbourethral glands secrete alkaline mucus for lubrication.

• Epididymis is the site of sperm maturation and storage.

2. Female Reproductive System

The female reproductive system includes:

• Ovaries

• Fallopian tubes (oviducts)

• Uterus

• Cervix

• Vagina

• External genitalia (vulva)

Functions

• Production of ova (oogenesis)

• Secretion of female sex hormones

• Fertilization, implantation, pregnancy and childbirth

Important Facts

• The ampulla of the fallopian tube is the usual site of fertilization.

• The endometrium is the inner lining of the uterus and undergoes cyclic changes.

• The myometrium is the muscular layer responsible for uterine contractions during labor.

3. Male Sex Hormones

Testosterone

Produced by Leydig cells of the testes under the influence of LH.

Functions

• Development of male reproductive organs

• Development of secondary sexual characteristics

• Maintenance of spermatogenesis

• Increase in muscle and bone mass

Hormonal Control

• Hypothalamus: GnRH

• Anterior pituitary: LH and FSH

• LH: Leydig cells: Testosterone

• FSH: Sertoli cells Spermatogenesis

4. Female Sex Hormones

Estrogen

Produced mainly by developing ovarian follicles.

Functions

• Development of female reproductive organs

• Development of secondary sexual characteristics

• Proliferation of endometrium

Progesterone

Produced mainly by the corpus luteum.

Functions

• Preparation of uterus for implantation

• Maintenance of pregnancy

• Reduction of uterine contractions

5. Spermatogenesis

Spermatogenesis is the formation of sperm in the seminiferous tubules of testes.

Sequence

Spermatogonium (2n)

• Primary spermatocyte (2n)

• Secondary spermatocyte (n)

• Spermatid (n)

• Spermatozoa (n)

Important Facts

• Begins at puberty.

• One primary spermatocyte produces four spermatozoa.

• Requires FSH and testosterone.

• Sertoli cells nourish developing sperm.

Memory Tip

LH Loves Leydig cells
FSH supports Sertoli cells

6. Oogenesis

Oogenesis is the formation of ova in ovaries.

Sequence

Oogonium (2n)

• Primary oocyte (2n)

• Secondary oocyte (n)

• Ovum (n)

Important Facts

• Begins during fetal life.

• Primary oocytes remain arrested in Prophase I until puberty.

• Secondary oocyte remains arrested in Metaphase II until fertilization.

• One primary oocyte produces only one functional ovum.

Memory Tip

Primary = Prophase I
Secondary = Second stop at Metaphase II

7. Menstrual Cycle

The average menstrual cycle lasts 28 days.

Menstrual Phase (Days 1–5)

• Shedding of endometrium occurs.

• Caused by fall in estrogen and progesterone.

Proliferative Phase (Days 6–14)

• Endometrium regenerates.

• Dominated by estrogen.

Ovulation (Day 14)

• Triggered by the LH surge.

• Secondary oocyte is released.

Secretory Phase (Days 15–28)

• Dominated by progesterone.

• Endometrium becomes thick and glandular.

Memory Tip

Estrogen Builds
Progesterone Protects

8. Fertilization

Fertilization is the fusion of sperm and ovum.

Site

• Usually occurs in the ampulla of fallopian tube.

Important Events

• Capacitation of sperm occurs in the female reproductive tract.

• Acrosomal reaction allows penetration of zona pellucida.

• Cortical reaction prevents polyspermy.

Important Fact

• Implantation usually occurs 6–7 days after fertilization.

9. Pregnancy

Pregnancy begins after implantation of the blastocyst in the uterine wall.

Placental Hormones

• Human chorionic gonadotropin (hCG)

• Human placental lactogen (hPL)

• Estrogen

• Progesterone

• Relaxin

Functions of Placenta

• Exchange of oxygen and nutrients

• Removal of waste products

• Endocrine function

Important Fact

• hCG maintains the corpus luteum during early pregnancy.

10. Parturition (Childbirth)

Parturition is the process of delivery of the baby.

Mechanism

• Stretching of cervix stimulates oxytocin release.

• Oxytocin increases uterine contractions.

• Contractions further stimulate oxytocin secretion.

• This is an example of positive feedback mechanism.

Important Hormones

• Oxytocin: Uterine contractions and milk ejection

• Prolactin: Milk production

• Relaxin: Relaxation of pelvic ligaments and cervix

Facts for One-Minute Revision

• Largest contribution to semen volume: Seminal vesicles

• Testosterone secretion: Leydig cells

• Blood-testis barrier: Sertoli cells

• Sperm maturation: Epididymis

• Fertilization site: Ampulla of the fallopian tube

• Implantation: Day 6–7

• Ovulation: LH surge

• Primary oocyte arrest: Prophase I

• Secondary oocyte arrest: Metaphase II

• Corpus luteum maintenance: hCG

• Milk production: Prolactin

• Milk ejection: Oxytocin

• Pregnancy-maintaining hormone: Progesterone

• Hormone responsible for endometrial proliferation: Estrogen

50 One-Liner Previous-Year Style Facts: Human Reproductive System

1. The testes are located in the scrotum to maintain a temperature approximately 2–3°C below body temperature for spermatogenesis.

2. The functional unit of the testis is the seminiferous tubule.

3. Sertoli cells are called the "nurse cells" of the testes.

4. Leydig cells are also known as interstitial cells.

5. Testosterone is secreted by Leydig cells under the influence of LH.

6. FSH acts primarily on Sertoli cells to promote spermatogenesis.

7. The blood-testis barrier is formed by tight junctions between Sertoli cells.

8. The acrosome of sperm is derived from the Golgi apparatus.

9. The middle piece of sperm contains numerous mitochondria.

10. Mature sperm are stored mainly in the epididymis.

11. The epididymis is the principal site for sperm maturation.

12. The vas deferens transports sperm from the epididymis to the urethra.

13. The ejaculatory duct is formed by the union of the vas deferens and seminal vesicle duct.

14. The seminal vesicles contribute the largest volume of semen.

15. Fructose present in semen is secreted mainly by the seminal vesicles.

16. The secretion of the prostate gland is slightly alkaline.

17. The bulbourethral glands secrete mucus for lubrication and neutralization of acidity.

18. One primary spermatocyte produces four spermatozoa.

19. Spermatogenesis begins at puberty.

20. Human sperm remain viable in the female reproductive tract for approximately 48–72 hours.

21. The ovary is the primary female reproductive organ.

22. The ovary produces both ova and female sex hormones.

23. The normal ovary contains follicles in different stages of development.

24. The mature ovarian follicle is called the Graafian follicle.

25. The corpus luteum develops from the ruptured Graafian follicle.

26. Progesterone is mainly secreted by the corpus luteum.

27. The usual site of fertilization is the ampulla of the fallopian tube.

28. The finger-like projections of the oviduct are called fimbriae.

29. The endometrium is the inner lining of the uterus.

30. The functional layer of the endometrium is shed during menstruation.

31. The average menstrual cycle lasts 28 days.

32. Menstruation occurs due to a fall in estrogen and progesterone levels.

33. The proliferative phase is dominated by estrogen.

34. The secretory phase is dominated by progesterone.

35. Ovulation is triggered by the LH surge.

36. In a 28-day cycle, ovulation generally occurs on the 14th day.

37. The primary oocyte remains arrested in Prophase I until puberty.

38. The secondary oocyte remains arrested in Metaphase II until fertilization.

39. One primary oocyte produces only one functional ovum.

40. Capacitation of sperm occurs in the female reproductive tract.

41. The acrosomal reaction helps sperm penetrate the zona pellucida.

42. The cortical reaction prevents polyspermy.

43. Implantation usually occurs 6–7 days after fertilization.

44. The outer cell layer of the blastocyst forms the trophoblast.

45. Human chorionic gonadotropin (hCG) maintains the corpus luteum during early pregnancy.

46. The placenta acts as both an exchange organ and an endocrine organ.

47. The placenta secretes hCG, hPL, estrogen, progesterone, and relaxin.

48. Prolactin is responsible for milk production after childbirth.

49. Oxytocin is responsible for milk ejection and uterine contractions.

50. Parturition is an example of a positive feedback mechanism mediated by oxytocin.

MCQs on Human Reproductive System for GPAT, NIPER, AIIMS Pharmacist, Railway Pharmacist, SSC, ESIC & State Pharmacist Exams

1. Which structure contributes the maximum volume to human semen?

A. Seminiferous tubules
B. Prostate gland
C. Seminal vesicles
D. Bulbourethral glands

Answer: C. Seminal vesicles

Explanation: Seminal vesicles contribute approximately 60–70% of semen volume and provide fructose for sperm energy.

2. Sertoli cells are primarily responsible for:

A. Testosterone secretion
B. Sperm maturation and nourishment
C. Secretion of prostaglandins
D. Production of LH

Answer: B. Sperm maturation and nourishment

3. Leydig cells are stimulated by which hormone?

A. FSH
B. LH
C. Prolactin
D. Oxytocin

Answer: B. LH

4. Which statement regarding the blood-testis barrier is correct?

A. It is formed by Leydig cells.
B. It prevents autoimmune destruction of sperm cells.
C. It separates epididymis from seminiferous tubules.
D. It allows free movement of antibodies into seminiferous tubules.

Answer: B. It prevents autoimmune destruction of sperm cells.

5. The acrosome of sperm is derived from the:

A. Golgi apparatus
B. Endoplasmic reticulum
C. Mitochondria
D. Nucleus

Answer: A. Golgi apparatus

6. Which part of sperm contains mitochondria arranged spirally?

A. Head
B. Acrosome
C. Middle piece
D. Tail

Answer: C. Middle piece

7. Spermatogenesis begins under the influence of:

A. Progesterone
B. Testosterone alone
C. FSH and testosterone
D. Estrogen and FSH

Answer: C. FSH and testosterone

8. One primary spermatocyte ultimately produces:

A. 1 spermatozoon
B. 2 spermatozoa
C. 3 spermatozoa
D. 4 spermatozoa

Answer: D. 4 spermatozoa

9. Oogenesis differs from spermatogenesis because

A. Oogenesis begins at puberty.
B. Oogenesis produces equal-sized gametes.
C. Cytoplasmic division is unequal in oogenesis.
D. Meiosis is completed before birth.

Answer: C. Cytoplasmic division is unequal in oogenesis.

10. Primary oocytes remain arrested in which stage until puberty?

A. Metaphase I
B. Prophase I
C. Metaphase II
D. Anaphase II

Answer: B. Prophase I

11. Secondary oocyte is arrested in:

A. Prophase I
B. Metaphase I
C. Metaphase II
D. Telophase II

Answer: C. Metaphase II

12. Fertilization normally occurs in the:

A. Uterus
B. Cervix
C. Ampulla of fallopian tube
D. Infundibulum

Answer: C. Ampulla of fallopian tube

13. Capacitation of sperm occurs in the:

A. Testis
B. Epididymis
C. Vas deferens
D. Female reproductive tract

Answer: D. Female reproductive tract

14. The zona pellucida prevents:

A. Implantation
B. Fertilization
C. Polyspermy
D. Cleavage

Answer: C. Polyspermy

15. Implantation generally occurs on the:

A. 2nd day after fertilization
B. 4th day after fertilization
C. 6th–7th day after fertilization
D. 14th day after fertilization

Answer: C. 6th–7th day after fertilization

16. Which hormone is responsible for maintaining the corpus luteum during early pregnancy?

A. LH
B. FSH
C. hCG
D. Estrogen

Answer: C. hCG

17. If fertilization does not occur, degeneration of the corpus luteum causes a fall in:

A. FSH only
B. LH only
C. Estrogen and progesterone
D. Oxytocin and prolactin

Answer: C. Estrogen and progesterone

18. The proliferative phase of the menstrual cycle is mainly under the influence of:

A. Progesterone
B. Estrogen
C. Oxytocin
D. Relaxin

Answer: B. Estrogen

19. The secretory phase of the menstrual cycle is mainly under the influence of:

A. FSH
B. LH
C. Progesterone
D. Estrogen

Answer: C. Progesterone

20. Ovulation is triggered by a sudden surge of

A. FSH
B. LH
C. Progesterone
D. Prolactin

Answer: B. LH

21. In a normal 28-day menstrual cycle, ovulation usually occurs on:

A. Day 7
B. Day 10
C. Day 14
D. Day 21

Answer: C. Day 14

22. Which hormone causes development of secondary sexual characters in females?

A. Progesterone
B. Estrogen
C. FSH
D. hCG

Answer: B. Estrogen

23. Which hormone prepares the endometrium for implantation?

A. Estrogen
B. Progesterone
C. Oxytocin
D. Prolactin

✅ Answer: B. Progesterone

24. The placenta primarily acts as:

A. Digestive organ only
B. Respiratory organ only
C. Endocrine organ only
D. Exchange and endocrine organ

Answer: D. Exchange and endocrine organ

25. Which hormone is NOT secreted by the placenta?

A. hCG
B. hPL
C. Progesterone
D. FSH

Answer: D. FSH

26. Human chorionic gonadotropin is functionally similar to:

A. FSH
B. LH
C. Prolactin
D. Oxytocin

Answer: B. LH

27. Milk ejection reflex is mediated mainly by:

A. Prolactin
B. Oxytocin
C. Estrogen
D. Progesterone

Answer: B. Oxytocin

28. Which hormone is responsible for milk production after childbirth?

A. Oxytocin
B. Prolactin
C. Relaxin
D. hPL

Answer: B. Prolactin

29. During parturition, the positive feedback mechanism involves:

A. Estrogen and progesterone
B. FSH and LH
C. Oxytocin and uterine contractions
D. Prolactin and oxytocin

Answer: C. Oxytocin and uterine contractions

30. Relaxin secreted during pregnancy mainly causes

A. Milk secretion
B. Endometrial shedding
C. Relaxation of pelvic ligaments and cervix
D. Ovulation

Answer: C. Relaxation of pelvic ligaments and cervix

31. Which of the following structures is homologous to the penis in females?

A. Labia majora
B. Vagina
C. Clitoris
D. Cervix

Answer: C. Clitoris

32. The broad ligament is associated with the:

A. Testis
B. Ovary and uterus
C. Epididymis
D. Prostate gland

Answer: B. Ovary and uterus

33. Which structure stores sperm temporarily before ejaculation?

A. Seminiferous tubules
B. Rete testis
C. Epididymis
D. Prostate gland

Answer: C. Epididymis

34. Which layer of the uterus is shed during menstruation?

A. Myometrium
B. Perimetrium
C. Functional layer of endometrium
D. Basal layer of endometrium

Answer: C. Functional layer of endometrium

35. A woman with blockage of both fallopian tubes is most likely to have difficulty with:

A. Ovulation
B. Fertilization
C. Menstruation
D. Hormone secretion

Answer: B. Fertilization.

Dr. Alok Singh