Reproductive Physiology Quiz: Hormonal Regulation Review

The testis is the primary male reproductive organ responsible for spermatogenesis and testosterone production. Sperm production occurs in seminiferous tubules, while Leydig cells synthesize testosterone. Testosterone regulates male secondary sexual characteristics such as voice deepening and muscle mass. The prostate contributes fluid to semen but does not produce sperm. Liver and pancreas are digestive and metabolic organs, confirming the testis as correct.

Sperm is the male gamete produced through meiosis inside seminiferous tubules of the testis. Each sperm contains 23 chromosomes and contributes half the genetic material during fertilization. Ovum is the female gamete, zygote forms after fertilization, and embryo represents later developmental stages. Therefore, sperm is biologically and genetically the correct male reproductive cell.

Semen is composed of sperm cells and seminal fluid secreted by seminal vesicles, prostate gland, and bulbourethral glands. The fluid provides fructose for energy and alkaline protection against acidic vaginal environment. Urine, saliva, and blood do not function in reproduction. Therefore, semen is the accurate biological term describing the sperm-containing fluid mixture.

The ovary is the female gonad responsible for producing ova and secreting estrogen and progesterone. Each ovary contains thousands of follicles, though typically one mature ovum is released per cycle. The uterus supports fetal development, cervix connects uterus to vagina, and fallopian tube transports the egg. Hence, ovary correctly produces female gametes.

Ovulation refers to the release of a mature ovum from a Graafian follicle, typically around day fourteen of a twenty eight day cycle. It is triggered by luteinizing hormone surge. Menstruation involves shedding uterine lining, fertilization is sperm-egg fusion, and implantation occurs after fertilization. Thus, ovulation specifically defines egg release.

Fertilization usually occurs in the ampulla region of the fallopian tube. Sperm must travel through the uterus to reach the ovum. After fusion, the zygote undergoes cleavage while moving toward the uterus. The ovary releases the egg but is not fertilization site. Therefore, fallopian tube is anatomically correct location.

Testosterone is produced by Leydig cells in testes and regulates male secondary sexual characteristics including facial hair growth, increased muscle mass, and deepened voice. Estrogen and progesterone primarily regulate female reproductive functions. Oxytocin influences uterine contractions and milk ejection. Therefore, testosterone is the principal hormone governing male secondary development.

The vas deferens is a muscular duct that transports mature sperm from the epididymis to the urethra during ejaculation. Peristaltic contractions facilitate movement. The epididymis stores and matures sperm but does not transport directly to urethra. Ureter carries urine from kidney, and seminal vesicle produces fluid. Thus, vas deferens is correct transport structure.

The ovum is the female gamete produced via oogenesis in the ovary. It contains 23 chromosomes and is significantly larger than sperm. After fertilization, it forms a zygote, which later develops into an embryo. Sperm is male gamete. Therefore, ovum is biologically accurate female reproductive cell.

In flowering plants, the ovary is the swollen basal part of the pistil that contains ovules. After fertilization, ovules develop into seeds while ovary matures into fruit. Petals attract pollinators, sepals protect bud, and stamen produces pollen. Therefore, ovary correctly houses ovules in angiosperms.