BIOL 2402 LAB EXAM 4 QUESTIONS WITH CORRECT ANSWERS LATEST UPDATE 2026
The human genome contains _____ chromosomes, 23 from the male parent and 23 from the female
parent. - Answers 46
The male reproductive system produces mobile sex cells or gametes called __________________
(sperm), each contain 23 chromosomes. - Answers spermatozoa
The sperm unites with the female gamete called an egg or _________ that also contains 23
chromosomes, in a process called ___________ producing a ______, an individual with a full
complement of chromosomes (46 chromosomes). - Answers oocyte
fertilization
zygote
In males, the primary sex organ is called the _______ and is the site of _____ production. - Answers
testes
sperm
Interstitial cells found in the testes, produce _____________, a hormone that regulates
spermatogenesis, the process by which sperm are formed. - Answers testosterone
_________________ stimulates production of male reproductive system in fetus and an adolescent.
Additionally, it is responsible for development of male secondary sex characteristics, the sex drive,
sperm production and sexual instinct throughout adult life. - Answers testosterone
The male secondary sex organs constitute a system of ducts, glands and the penis which function in
the maturation, storage, survival and transport of ______. - Answers sperm
The system of ___________ include the efferent ductules, epididymis, ductus deferens, ejaculatory
duct, and urethra. The ___________glands support the viability of sperm by contributing fluids to
form ______; these glands include the seminal vesicles, prostate gland, and bulbourethral glands. -
Answers ducts
accessory
semen
The male copulatory organ, the ______, delivers sperm into the female reproductive system -
Answers penis
The paired testes or testicles, produce the male gamete, sperm (_______________) - Answers
spermatozoa
The testicles are oval shaped and are located externally, outside the body cavity in a sac known as the
__________-- that is lined by muscles and covered by skin. - Answers scrotum
A countercurrent heat exchange between the testicular artery and a network of testicular veins,
collectively called the __________ _________, transfers heat from incoming arterial blood supply to
the veins heading back into the body cavity - Answers pampiniform plexus
Several layers of fascia and a capsule of connective tissue known as the __________ __________
envelope each testis, providing some support and protection. - Answers tunica vaginalis
Subcutaneous to the scrotal skin is a layer of smooth muscle, the _______ __________ which when
contracted, wrinkles the skin of the scrotum. - Answers dartos muscle
Additionally, another muscle called the ___________ extends from the internal abdominal oblique
muscle down the spermatic cord and surrounds each testicle. - Answers cremaster
Attached to the tunica vaginalis is a cord of various tissues known as the ___________ ________ that
extends from the testes into the pelvic cavity. - Answers spermatic cord
The spermatic cord is underlain with ___________ muscle and together they surround lymphatic
vessels, blood vessels (pampiniform plexus), nerves, and the ductus deferens that extends upward
into the pelvic cavity from each testis. - Answers cremaster
The external surface of the testis is formed by a thin capsule of fibrous connective tissue, called the
____________ ____________ - Answers tunica albuginea.
A section through the testis reveals that its interior is dominated by tightly coiled ___________
_______________, the site of spermatogenesis. - Answers seminiferous tubules
The tubules are organized into small compartments, known as ___________, formed by inward
extensions of the tunica albuginea. - Answers lobules
Each lobule contains one to three seminiferous tubules and interspersed between seminiferous
tubules are _________ ______ that secrete the male hormone testosterone. - Answers interstitial
cells
, From the seminiferous tubules site of spermatogenesis, sperm or spermatozoa, pass into a network of
interconnecting tubes called the _____ ____, through efferent ductules and into the ___________
where they are stored and mature until ejaculation. - Answers rete testis, epididymis
During ejaculation, spermatozoa travel from the epididymis through a series of tubules including the
ductus deferens, ___________ duct, and the urethra. - Answers ejaculatory
The process of sperm production or ______________, takes place in the seminiferous tubules and
involves the formation of four _______ (1n) spermatozoa from a single _______ (2n)
spermatogonium. - Answers spermatogenesis
haploid
diploid
Spermatogenesis begins with diploid germ cells called ________________________ located on the
walls of the seminiferous tubules - Answers type A spermatogonia
Each Type A spermatogonium divides by mitosis to produce two diploid cells: a spermatogonium that
remains close to the wall of the tubule and a _____________________________ - Answers type B
spermatogonium
The type B spermatogonium enlarges and moves close to the blood-testis barrier formed by
____________ cells (nurse cells); it is now called a ___________ ______________ - Answers
sustentacular
primary spermocyte
The primary spermatocyte crosses the blood testis barrier and begins __________ - Answers meiosis
During ________ __, each primary spermatocyte becomes a genetically unique cell and thus, is
protected from the immune system by the blood-testis barrier. - Answers meiosis I
Each secondary spermatocytes completes ___________ leading to the formation of four haploid
___________- - Answers meiosis II
spermatids
Spermatids undergo a maturation process known as ____________that transforms spermatids into
motile, compact cells called ____________(singular: spermatozoon). - Answers spermiogenesis
spermatozoa
Each spermatozoon consists of a head containing 23 chromosomes capped by an _________, a
____________ or tail, and a __________ containing mitochondria that provide the energy for the
flagellum to propel the cell forward - Answers acrosome, flagellum, midpiece
The rete testis and efferent ductules direct sperm from the seminiferous tubules to the ___________,
a narrow, convoluted tube extending along the posterior side of the testis - Answers epididymis
The ___________ is a single duct that serves as the site of sperm maturation and storage. Its wall
contains some smooth muscle, providing peristaltic contractions that move sperm into the next duct,
the ________ ________ - Answers epididymis
ductus deferens
The ductus deferens, or ___ _________, is much thicker in diameter than the epididymis due to the
abundance of smooth muscle that contracts to move sperm by peristalsis. The ductus deferens rises
from its origin at the tail (inferior end) of the epididymis to join other parts of the spermatic cord that
extend from the scrotum, entering the pelvic cavity through openings in the anterior wall called the
________ ______ - Answers vas deferens
inguinal canal
Behind the urinary bladder, the ductus deferens broadens to form an ________ that joins the duct of
the seminal vesicle to form the short ejaculatory duct. The two ejaculatory ducts, one from each side,
extend medially until they unite with the _______ urethra within the prostate gland that is located
inferior to the urinary bladder. - Answers ampulla
prostatic
The __________ carries sperm from the ejaculatory ducts to the exterior of the body. It is divided into
three segments in the male. - Answers urethra
The first segment, the ________ urethra, extends from the internal urethral orifice through the
prostate gland - Answers prostatic
As it emerges from the prostate gland, the second segment, the __________ urethra, begins. It
extends through the urogenital diaphragm to the root of the penis. - Answers membranous
At the root of the penis, the final segment, the ______ urethra, begins and extends through the penis
to eventually open to the exterior at the external urethral orifice. - Answers spongy
The human genome contains _____ chromosomes, 23 from the male parent and 23 from the female
parent. - Answers 46
The male reproductive system produces mobile sex cells or gametes called __________________
(sperm), each contain 23 chromosomes. - Answers spermatozoa
The sperm unites with the female gamete called an egg or _________ that also contains 23
chromosomes, in a process called ___________ producing a ______, an individual with a full
complement of chromosomes (46 chromosomes). - Answers oocyte
fertilization
zygote
In males, the primary sex organ is called the _______ and is the site of _____ production. - Answers
testes
sperm
Interstitial cells found in the testes, produce _____________, a hormone that regulates
spermatogenesis, the process by which sperm are formed. - Answers testosterone
_________________ stimulates production of male reproductive system in fetus and an adolescent.
Additionally, it is responsible for development of male secondary sex characteristics, the sex drive,
sperm production and sexual instinct throughout adult life. - Answers testosterone
The male secondary sex organs constitute a system of ducts, glands and the penis which function in
the maturation, storage, survival and transport of ______. - Answers sperm
The system of ___________ include the efferent ductules, epididymis, ductus deferens, ejaculatory
duct, and urethra. The ___________glands support the viability of sperm by contributing fluids to
form ______; these glands include the seminal vesicles, prostate gland, and bulbourethral glands. -
Answers ducts
accessory
semen
The male copulatory organ, the ______, delivers sperm into the female reproductive system -
Answers penis
The paired testes or testicles, produce the male gamete, sperm (_______________) - Answers
spermatozoa
The testicles are oval shaped and are located externally, outside the body cavity in a sac known as the
__________-- that is lined by muscles and covered by skin. - Answers scrotum
A countercurrent heat exchange between the testicular artery and a network of testicular veins,
collectively called the __________ _________, transfers heat from incoming arterial blood supply to
the veins heading back into the body cavity - Answers pampiniform plexus
Several layers of fascia and a capsule of connective tissue known as the __________ __________
envelope each testis, providing some support and protection. - Answers tunica vaginalis
Subcutaneous to the scrotal skin is a layer of smooth muscle, the _______ __________ which when
contracted, wrinkles the skin of the scrotum. - Answers dartos muscle
Additionally, another muscle called the ___________ extends from the internal abdominal oblique
muscle down the spermatic cord and surrounds each testicle. - Answers cremaster
Attached to the tunica vaginalis is a cord of various tissues known as the ___________ ________ that
extends from the testes into the pelvic cavity. - Answers spermatic cord
The spermatic cord is underlain with ___________ muscle and together they surround lymphatic
vessels, blood vessels (pampiniform plexus), nerves, and the ductus deferens that extends upward
into the pelvic cavity from each testis. - Answers cremaster
The external surface of the testis is formed by a thin capsule of fibrous connective tissue, called the
____________ ____________ - Answers tunica albuginea.
A section through the testis reveals that its interior is dominated by tightly coiled ___________
_______________, the site of spermatogenesis. - Answers seminiferous tubules
The tubules are organized into small compartments, known as ___________, formed by inward
extensions of the tunica albuginea. - Answers lobules
Each lobule contains one to three seminiferous tubules and interspersed between seminiferous
tubules are _________ ______ that secrete the male hormone testosterone. - Answers interstitial
cells
, From the seminiferous tubules site of spermatogenesis, sperm or spermatozoa, pass into a network of
interconnecting tubes called the _____ ____, through efferent ductules and into the ___________
where they are stored and mature until ejaculation. - Answers rete testis, epididymis
During ejaculation, spermatozoa travel from the epididymis through a series of tubules including the
ductus deferens, ___________ duct, and the urethra. - Answers ejaculatory
The process of sperm production or ______________, takes place in the seminiferous tubules and
involves the formation of four _______ (1n) spermatozoa from a single _______ (2n)
spermatogonium. - Answers spermatogenesis
haploid
diploid
Spermatogenesis begins with diploid germ cells called ________________________ located on the
walls of the seminiferous tubules - Answers type A spermatogonia
Each Type A spermatogonium divides by mitosis to produce two diploid cells: a spermatogonium that
remains close to the wall of the tubule and a _____________________________ - Answers type B
spermatogonium
The type B spermatogonium enlarges and moves close to the blood-testis barrier formed by
____________ cells (nurse cells); it is now called a ___________ ______________ - Answers
sustentacular
primary spermocyte
The primary spermatocyte crosses the blood testis barrier and begins __________ - Answers meiosis
During ________ __, each primary spermatocyte becomes a genetically unique cell and thus, is
protected from the immune system by the blood-testis barrier. - Answers meiosis I
Each secondary spermatocytes completes ___________ leading to the formation of four haploid
___________- - Answers meiosis II
spermatids
Spermatids undergo a maturation process known as ____________that transforms spermatids into
motile, compact cells called ____________(singular: spermatozoon). - Answers spermiogenesis
spermatozoa
Each spermatozoon consists of a head containing 23 chromosomes capped by an _________, a
____________ or tail, and a __________ containing mitochondria that provide the energy for the
flagellum to propel the cell forward - Answers acrosome, flagellum, midpiece
The rete testis and efferent ductules direct sperm from the seminiferous tubules to the ___________,
a narrow, convoluted tube extending along the posterior side of the testis - Answers epididymis
The ___________ is a single duct that serves as the site of sperm maturation and storage. Its wall
contains some smooth muscle, providing peristaltic contractions that move sperm into the next duct,
the ________ ________ - Answers epididymis
ductus deferens
The ductus deferens, or ___ _________, is much thicker in diameter than the epididymis due to the
abundance of smooth muscle that contracts to move sperm by peristalsis. The ductus deferens rises
from its origin at the tail (inferior end) of the epididymis to join other parts of the spermatic cord that
extend from the scrotum, entering the pelvic cavity through openings in the anterior wall called the
________ ______ - Answers vas deferens
inguinal canal
Behind the urinary bladder, the ductus deferens broadens to form an ________ that joins the duct of
the seminal vesicle to form the short ejaculatory duct. The two ejaculatory ducts, one from each side,
extend medially until they unite with the _______ urethra within the prostate gland that is located
inferior to the urinary bladder. - Answers ampulla
prostatic
The __________ carries sperm from the ejaculatory ducts to the exterior of the body. It is divided into
three segments in the male. - Answers urethra
The first segment, the ________ urethra, extends from the internal urethral orifice through the
prostate gland - Answers prostatic
As it emerges from the prostate gland, the second segment, the __________ urethra, begins. It
extends through the urogenital diaphragm to the root of the penis. - Answers membranous
At the root of the penis, the final segment, the ______ urethra, begins and extends through the penis
to eventually open to the exterior at the external urethral orifice. - Answers spongy
