Male Reproductive System Quiz

Reproductive System Overview

• The reproductive system's primary functions include gamete production, fertilization, development, and reproductive hormone production.
• Learning objectives include describing the structures and functions of male and female reproductive systems, determining functions of reproductive hormones, explaining ovulation and the menstrual cycle.

Reproductive System Functions

• Production of gametes (sex cells): sperm in males, oocytes (eggs) in females
• Fertilization: union of sperm and oocyte
• Development and nourishment of a new individual
• Production of reproductive hormones

Major Reproductive Organs

• Diagrams showing male and female reproductive organs are presented.
• Key male organs include testes, epididymis, ductus deferens, seminal vesicles, prostate gland, bulbourethral glands, and penis.
• Key female organs include ovaries, uterine tubes, uterus, and vagina.
• Mammary glands (in the breasts) are also part of the female reproductive system.

Formation of Gametes

• Gametes are sex cells.
• Male gametes are sperm.
• Female gametes are oocytes (eggs).
• Meiosis is a special cell division creating sex cells.
• Each sperm and oocyte contain 23 chromosomes.

From Fertilization to Fetus

• Fertilization is the union of sperm and oocyte.
• Zygote is the result of fertilization.
• Zygote develops into an embryo (3-14 days after fertilization).
• Embryo transforms into a fetus (14-56 days after fertilization).
• Fetus develops after 56 days following fertilization

Male Reproductive System

• Detailed diagrams of male reproductive structures are provided.
• The scrotum houses the testes.
• Sperm develops at a temperature lower than body temperature.
• Testes are primary male reproductive organs.
• Testes produce sperm within seminiferous tubules.
• Testes contain interstitial cells producing testosterone; germ cells forming sperm; and sustentacular cells related to sperm.
• Epididymis are thread-like tubules where sperm mature and gain motility.
• Ductus deferens (vas deferens) extends from epididymis, connecting to seminal vesicles.
• Urethra transports urine and semen.
• Penis transfers sperm from male to female and excretes urine.
• Glands (seminal vesicles, prostate, and bulbourethral) produce fluids for semen.

Male Reproductive Glands

• Seminal vesicles are located next to the ductus deferens and contribute to ejaculatory fluid.
• Prostate gland surrounds the urethra and secretes components for semen.
• Bulbourethral glands secrete mucus.

Semen

• Semen is a mixture of sperm and secretions from various glands.
• Semen transports and nourishes sperm; it also activates sperm.
• Seminal vesicles contribute 60% of semen volume; the prostate gland contributes 30%; the bulbourethral glands contribute 5%.

Seminal Vesicles

• Seminal vesicles provide fructose within semen; they also provide prostaglandins.
• Prostaglandins thin mucus in the female reproductive tract, facilitating sperm movement.

Prostate Gland

• Prostate gland contains enzymes liquefying semen after it enters the female.
• It also neutralizes acidity within the vagina and the male urethra.

Bulbourethral Glands

• These glands neutralize acidity in the male urethra and female vagina.

Testicular Secretions

• Testes secrete sperm and a small amount of fluid, combining to form semen.
• An average ejaculation contains 2-5 milliliters of semen, with approximately 100 million sperm per milliliter.
• Sperm survives for up to 72 hours in females.

Path of Sperm

• Sperm production is in seminiferous tubules of the testes; they mature in the epididymis.
• Ductus deferens carries sperm to ejaculatory ducts.
• Semen collects, and exits through the urethra.

Sperm Cell Structure

• Sperm heads contain DNA and nuclei.
• Midpieces contain mitochondria.
• Tails have flagella to propel sperm.

Male Sex Hormones

• Gonadotropin-releasing hormone (GnRH) stimulates secretion of LH and FSH.
• Luteinizing hormone (LH) stimulates, testosterone secretion.
• Follicle-stimulating hormone (FSH) promotes spermatogenesis.
• Testosterone regulates reproductive organ development and maintenance.
• Inhibin, produced by Sertoli cells, inhibits spermatogenesis when sperm count is high.

Male Puberty

• A series of events where boys develop male hormones and sperm cells.
• Starts at 12-14 years, ending around 18.
• Testosterone is the major male hormone, resulting in secondary sexual characteristics (e.g., skin texture changes, fat distribution, hair growth, muscle development).

Female Reproductive System

• Overview of the female reproductive system is presented.

Female Pelvis

• Detailed female pelvic illustration showing key aspects of the female reproductive anatomy is presented.

Ovaries

• Ovaries are primary female reproductive organs located on either side of the uterus.
• They produce oocytes and female sex hormones.

Structure of Ovary and Ovarian Follicles

• Diagrams depicting ovarian follicles and their stages are provided.
• Ovarian follicles contain oocytes (eggs).

Uterine (Fallopian) Tubes

• Tubes extend from ovaries to uterus.
• Fimbriae help sweep oocytes into uterine tubes.
• Tubal ligation is a sterilization method.

Uterus

• Pear-shaped structure in the pelvic cavity.
• Functions include receiving, retaining, and nourishing the fertilized oocyte; and the development of the embryo.
• The body is the main part of the uterus; the cervix connects to the vagina.

Uterus Wall Layers

• Perimetrium: outermost layer
• Myometrium: middle muscular layer
• Endometrium: innermost layer that is involved in the menstrual cycle and uterine lining

Vagina

• The vagina extends from the uterus to the body's exterior.
• It's the female copulatory organ, receiving the penis during intercourse.
• It also allows menstruation flow.
• It's involved in childbirth.

External Female Genitalia

• The vulva comprises the external female sex organs (mons pubis, labia majora, labia minora, clitoris, vestibule).
• The vestibule is the space where the vaginal and urethral openings are located.
• Labia minora are inner folds of skin; labia majora are outer folds; the clitoris is the equivalent of the male penis.

Ovulation, Menstrual Cycle, Menopause

• Overview of the menstrual cycle are details provided.

Ovulation

• Release of an oocyte from the ovary, facilitated by luteinizing hormone (LH).
• Corpus luteum develops after ovulation, producing progesterone.

Oogenesis and Fertilization

• Females are born with all their oogonia (immature egg cells).
• Around 300,000-400,000 primary oocytes remain at puberty.
• Secondary oocytes are swept into a uterine tube and may be fertilized if sperm is present during ovulation; the zygote then implants in the uterus.

Female Puberty

• Female puberty occurs between 11 to 13 years of age, normally concluding by 16.
• Menarche signifies the first menstrual bleeding.
• Female genitals enlarge and fat is deposited in breasts and hips during this time.
• Elevated estrogen and progesterone levels are typical during female puberty.

Mammary Glands

• The breasts contain mammary glands, structures producing milk.
• They begin to enlarge during puberty.
• Composed of lobes covered by adipose tissue. Lobules, composed of ducts and alveoli, are responsible for milk production.
• Tissue structure varies between lactating and non-lactating women.

Female Sex Hormones

• Gonadotropin-releasing hormone (GnRH) from the hypothalamus stimulates LH and FSH release.
• Luteinizing hormone (LH) triggers ovulation.
• Follicle-stimulating hormone (FSH) stimulates follicle development.
• Estrogen affects proliferation of endometrial cells; mammary gland duct development; LH and FSH control; secondary sex characteristics.
• Progesterone influences endometrial cell enlargement, pregnancy maintenance, mammary gland maturation, and estrogen, FSH, and LH hormone control; and development of secondary sex characteristics.

Menstrual Cycle

• A series of changes in the sexually mature, non-pregnant female.
• Menses involve shedding of the endometrium.
• The average menstrual cycle lasts around 28 days.
• Cyclical changes in the endometrium are crucial.

Stages of Menstrual Cycle

• Detailed stages of the menstrual cycle, along with hormone levels and uterine activity, are described in various stages, from menstruation to ovulation and the secretory phase.

Menopause

• Menopause is characterized by the ovaries secreting fewer hormones and having fewer follicles.
• Menstrual cycles and ovulation become less frequent or irregular.
• Symptoms such as fatigue and irritability can manifest.
• Hormone therapy might be used to manage side effects.

Test your knowledge on the male reproductive system with this quiz covering sperm lifespan, maturation, hormone functions, and spermatogenesis. Ideal for biology students, this quiz will enhance your understanding of key concepts related to male reproductive physiology.