Module 9: The Reproductive System
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Questions and Answers

What is the anatomy of seminiferous tubules?

Seminiferous tubules are located in the testis, made up of columnar Sertoli cells surrounded by spermatogenic cells on the epithelial interior and stem cells exteriorly.

What is the function of seminiferous tubules?

The seminiferous tubules function to produce sperm, maintain sperm, and store the sperm.

Where is semen produced?

Semen is produced in the seminiferous tubules located inside the testes.

What are the contents of sperm?

<p>Sperm contains citrate, amino acids, flavins, enzymes, fructose, vitamin C, calcium, chlorine, citric acid, lactic acid, magnesium, nitrogen, phosphorus, phosphorylcholine, potassium, sodium, vitamin B12, acid phosphatase, proteins, lipids, and zinc.</p> Signup and view all the answers

What is the structure of the epididymis?

<p>The epididymis is a long, coiled tube that stores sperm and transports it from the testes, comprising three sections: head, body, and tail.</p> Signup and view all the answers

What is the function of the epididymis?

<p>The epididymis transports and stores sperm cells produced in the testes and brings sperm to maturity.</p> Signup and view all the answers

What is the function of estrogen?

<p>The primary function of estrogens includes development of female secondary sexual characteristics, and in males, it helps in sperm maturation and libido maintenance.</p> Signup and view all the answers

What is the function of progesterone?

<p>Progesterone thickens the lining of the uterus to prepare for a fertilized egg and is produced in the placenta during pregnancy.</p> Signup and view all the answers

What are the chromosome aspects of the sperm and eggs?

<p>Humans have 22 chromosome pairs and two sex chromosomes; females have two X chromosomes and males have an X and a Y chromosome.</p> Signup and view all the answers

What arteries supply the ovaries with blood?

<p>The ovarian arteries supply the ovaries by traveling through the suspensory ligament.</p> Signup and view all the answers

What are the uterine tubes also called?

<p>The uterine tubes are also called fallopian tubes or oviducts.</p> Signup and view all the answers

What are the three layers of the uterine walls?

<p>The three layers are the perimetrium, myometrium, and endometrium.</p> Signup and view all the answers

What are the three regions of the uterus?

<p>The three regions of the uterus are fundus, body, and cervix.</p> Signup and view all the answers

What is the vagina?

<p>The vagina is a thin-walled tube, also called the birth canal, about 4 inches long.</p> Signup and view all the answers

What makes up the female external genitalia?

<p>The female external genitalia includes the mons pubis, labia (majora and minora), clitoris, and vestibule structures.</p> Signup and view all the answers

What do the reproductive organs consist of?

<p>The reproductive organs consist of primary sex organs (gonads) and accessory organs (secondary organs).</p> Signup and view all the answers

What covers the male and female gonads?

<p>A connective tissue covering called the tunica albuginea covers the gonads.</p> Signup and view all the answers

What do male gonads (testes) produce?

<p>Male gonads (testes) produce sperm and testosterone.</p> Signup and view all the answers

What do female gonads (ovaries) produce?

<p>Female gonads (ovaries) produce eggs, estrogen, and progesterone.</p> Signup and view all the answers

What are the functions of the male reproductive system?

<p>The functions include producing gametes (sperm), expelling gametes to the female reproductive system, and producing testosterone.</p> Signup and view all the answers

What are the functions of the female reproductive system?

<p>The functions include producing gametes (eggs/ova), producing estrogen and progesterone, housing and nurturing the embryo/fetus, and delivering the fetus.</p> Signup and view all the answers

What are the male secondary/accessory sex organs?

<p>The male secondary/accessory sex organs include the scrotum, male duct system, penis, and accessory glands (prostate gland, seminal vesicles, bulbourethral glands).</p> Signup and view all the answers

What are the two main types of cells within the seminiferous tubules?

<p>The two main types of cells are germ cells and sustentocytes (specifically Sertoli cells).</p> Signup and view all the answers

What are the three mechanisms that assist in temperature regulation of the testes?

<p>The mechanisms are dartos muscle, cremaster muscles, and pampiniform venous plexus.</p> Signup and view all the answers

Study Notes

Anatomy of Seminiferous Tubules

  • Seminiferous tubules located in the testes consist of columnar Sertoli cells and spermatogenic cells.
  • Two layers exist: inner epithelial layer (spermatogenic cells) and outer layer (stem cells).

Function of Seminiferous Tubules

  • Responsible for the production, maintenance, and storage of sperm.
  • Sertoli cells undergo differentiation during meiosis to produce mature sperm.

Semen Production

  • Sperm develop within coiled seminiferous tubules in the testes.
  • Developmental stages occur from peripheral (least-developed) to lumen (fully-developed) within the tubules.

Contents of Sperm

  • Includes citrate, amino acids, flavins, enzymes, fructose, vitamins (C, B12), minerals (calcium, magnesium), and various sugars and acids.

Structure of the Epididymis

  • A long, coiled tube that stores and transports sperm from the testes.
  • Composed of three sections: head, body, and tail; located at the posterior margin of each testis.

Function of the Epididymis

  • Matures and stores immature sperm produced in the testes.
  • During arousal, contractions push sperm into the vas deferens.

Function of Estrogen

  • Promotes development of female secondary sexual characteristics such as breasts and regulates the menstrual cycle.
  • In males, aids in sperm maturation and maintaining libido.

Function of Progesterone

  • Thickens the uterine lining to prepare for a fertilized egg.
  • Produced by the placenta during pregnancy, maintaining elevated levels throughout.

Chromosome Aspects of Sperm and Eggs

  • Humans have 22 pairs of autosomes and 2 sex chromosomes (XX in females, XY in males).

Ovulation

  • Release of a mature egg from the ovary, typically around days 14-16 in a 28-day menstrual cycle.
  • If unfertilized, the egg is shed during menstruation.

Arteries Supplying the Ovaries

  • Ovarian arteries reach the ovaries through the suspensory ligament.

Uterine Tubes (Fallopian Tubes)

  • Connect the ovaries to the uterus; approximately 4 inches long.
  • Comprise three sections: isthmus, ampulla, infundibulum, and fimbriae.

Layers of Uterine Walls

  • Three distinct layers: Perimetrium, Myometrium, and Endometrium.

Regions of the Uterus

  • Consists of three regions: Fundus, Body, and Cervix.

Vagina Structure

  • A thin-walled tube about 4 inches long, located between the rectum and bladder.
  • Contains various structures including vaginal fornix, orifice, rugae, and hymen.

Female External Genitalia

  • Composed of the mons pubis, labia (majora and minora), clitoris, and vestibule structures.

Reproductive Organs Composition

  • Comprised of primary sex organs (gonads) and accessory (secondary) organs.

Gonads Connective Tissue

  • Male and female gonads are covered by tunica albuginea, a connective tissue.

Male Gonadal Production

  • Testes produce sperm and testosterone, key for male reproductive function.

Female Gonadal Output

  • Ovaries produce eggs, estrogen, and progesterone critical for female reproduction.

Male Reproductive System Functions

  • Produces sperm (gametes), expels and delivers them to the female system, and secretes testosterone.

Female Reproductive System Functions

  • Produces eggs, secretes estrogen and progesterone, houses and nurtures the embryo, and delivers the fetus.

Male Secondary/Accessory Sex Organs

  • Includes the scrotum, male duct system (vas deferens), penis, and accessory glands (prostate, seminal vesicles, bulbourethral glands).

Types of Cells in Seminiferous Tubules

  • Contains germ cells (sperm precursors) and sustentocytes (Sertoli cells).

Testes Temperature Regulation

  • Regulated by the dartos muscle, cremaster muscles, and pampiniform venous plexus to maintain optimal sperm production conditions.

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This quiz focuses on the anatomy and functions of seminiferous tubules in the reproductive system. It covers key definitions and processes related to sperm production and maintenance. Perfect for anyone studying human anatomy or reproductive biology.

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