Deck 27: The Male Reproductive System

Question 1

The gene that codes for the testis-determining factor (TDF) is found in or on

A)the Y chromosome.
B)the X chromosome.
C)the gonadal ridges.
D)the fetal testes.
E)the mesonephros.

Answer 1

A

Question 2

The first haploid stage of spermatogenesis is prophase II.

Answer 2

True

Question 3

The mechanism that keeps the testes cooler than the body's core temperature is called descent of the
testes.

Answer 3

False

Question 4

Sexual reproduction entails the union of two gonads to form a zygote.

Question 5

Myotonia of skeletal muscles is characteristic of the excitement phase and refractory period.

Question 6

Spermiogenesis is the last stage of meiosis.

Question 7

Sustentacular cells secrete inhibin, which regulates the rate of sperm production.

Question 8

Testosterone stimulates development of the secondary sex characteristics, spermatogenesis, and
libido.

Question 9

The presence of the Y chromosome guarantees the development of male secondary sex organs.

Question 10

At early puberty, follicle stimulating hormone (FSH) and luteinizing hormone (LH) stimulate enlargement of the testes.

Question 11

determine/s whether an organism will be genetically male or female.

A)Hormonal, genetic and environmental factors
B)Prenatal hormone exposure
C)The egg
D)The sperm
E)Both egg and sperm equally

Question 12

is/are generally accepted as a secondary sex characteristic.

A)The enlargement of the breasts
B)The presence of testes
C)The prostate gland
D)The uterus
E)The vagina

Question 13

The scrotum contains the testes and spermatic cords.

Question 14

Erectile dysfunction prevents ejaculation in most cases.

Question 15

Which of the following is a secondary sex organ?

A)testis
B)ovary
C)vagina
D)facial hair
E)distribution of body fat

Question 16

Sympathetic nerve fibers trigger the secretion of nitric oxide, which dilates the deep arteries allowing
blood to engorge the penis.

Question 17

Sperm travels along the ductus deferens before reaching the spermatic cord.

Question 18

Only germ cells undergo meiosis, which produces four haploid cells with 23 chromosomes each.

Question 19

Sperm make up just 10% of semen volume.

Question 20

Which of the following are primary sex organs?

A)ova
B)uterine tubes
C)breasts
D)ovaries
E)scent glands

Question 21

The is/are the site(s) of sperm maturation and storage.

A)seminiferous tubules
B)rete testis
C)prostate gland
D)ductus epididymides
E)seminal vesicles

Question 22

From their formation to ejaculation, sperm cells take the following pathway:

A)seminiferous tubule, epididymis, rete testis, urethra, ejaculatory duct, ductus deferens.
B)seminiferous tubule, epididymis, rete testis, ejaculatory duct, ductus deferens, urethra.
C)seminiferous tubule, epididymis, rete testis, ductus deferens, ejaculatory duct, urethra.
D)seminiferous tubule, rete testis, epididymis, ductus deferens, ejaculatory duct, urethra.
E)seminiferous tubule, rete testis, epididymis, ejaculatory duct, urethra, ductus deferens.

Question 23

This image shows a sagittal section of the male reproductive system.What does "4" represent?

A)seminal vesicle
B)urethra
C)bulbourethral gland
D)prostate gland
E)ejaculatory duct

Question 24

Why would an enlarged prostate gland interfere with urination?

A)It inhibits urine production.
B)It develops calcified deposits that block the urethra.
C)It produces thicker prostatic secretions that block the urethra.
D)It inhibits the micturition reflex.
E)It compresses the urethra.

Question 25

The countercurrent heat exchanger that prevents arterial blood from overheating the testes is

A)the rete testis.
B)the epididymis.
C)the pampiniform plexus of veins.
D)the blood-testis barrier.
E)the scrotal portal system.

Question 26

Which of the following hormones directly stimulates the development of male secondary sex characteristics?

A)estrogen
B)inhibin
C)luteinizing hormone
D)follicle stimulating hormone
E)testosterone

Question 27

The penile urethra is enclosed by the

A)corpus cavernosum.
B)corpus spongiosum.
C)trabecular muscle.
D)prepuce.
E)frenulum.

Question 28

Men have only one but have two of all the rest of these.

A)bulbourethral gland(s)
B)prostate gland(s)
C)ejaculatory duct(s)
D)seminal vesicle(s)
E)corpus(ora) cavernosum(a)

Question 29

This image shows a section of the testis and scrotal contents.What does "2" represent?

A)spermatic cord
B)epididymis
C)rete testis
D)seminiferous tubules
E)ductus (vas) deferens

Question 30

The penis is homologous to

A)the appendix.
B)a finger.
C)the urethra.
D)the vagina.
E)the clitoris.

Question 31

When do the testes start secreting testosterone?

A)in the first trimester of fetal development
B)in the first trimester after birth
C)in the first three years after birth
D)in the first three years of adolescence
E)after the first ejaculation

Question 32

stimulates the interstitial cells of the testes to secrete .

A)Gonadotropin-releasing hormone (GnRH); LH
B)Follicle-stimulating hormone (FSH); androgen-binding protein (ABP)
C)Luteinizing hormone (LH); androgen-binding protein (ABP)
D)Luteinizing hormone (LH); testosterone
E)Luteinizing hormone (LH); estrogen

Question 33

The is the gonad and the is the gamete.

A)testis; ovary
B)testis; semen
C)testis; sperm
D)sperm; semen
E)semen; sperm

Question 34

By volume, most of the semen is produced in the

A)testes.
B)penis.
C)prostate gland.
D)seminal vesicles.
E)bulbourethral glands.

Question 35

are not found in or around the seminiferous tubules.

A)Interstitial (Leydig) cells
B)Germ cells
C)Sustentacular (Sertoli) cells
D)Spermatids
E)Corpus cavernosum cells

Question 36

When it is cold, the contracts and draws the testes closer to the body to keep them warm.

A)cremaster muscle
B)pampiniform plexus
C)corpus spongiosum
D)perineum
E)corpus cavernosum

Question 37

stimulates the descent of the testes.

A)The presence of Y chromosome
B)The presence of the X chromosome
C)The absence of the X chromosome
D)Testosterone
E)Estrogens

Question 38

The is an example of the female external genitalia.

A)scrotum
B)clitoris
C)uterine tube
D)seminal vesicle
E)vagina

Question 39

All of the following play a role in thermoregulation of the testes except

A)the bulbospongiosus muscle.
B)the cremaster muscle.
C)the pampiniform plexus of veins.
D)the countercurrent heat exchanger.
E)the dartos muscle.

Question 40

Which of the following is an androgen?

A)estrogen
B)progesterone
C)testosterone
D)luteinizing hormone (LH)
E)follicle-stimulating hormone (FSH)

Question 41

Heart rate, blood pressure, and respiratory rate peak during the

A)excitement phase.
B)erection of the penis.
C)climax (orgasm).
D)plateau phase.
E)resolution phase.

Question 42

The has/have no androgen receptors and do/does not respond to it.

A)germ cells
B)muscular tissue
C)sustentacular cells
D)hypothalamus
E)pituitary gland

Question 43

Sperm cells get energy to power their movement from contributed by the .

A)prostaglandins; prostate gland
B)sucrose; bulbourethral gland
C)fructose; seminal vesicles
D)seminogelin; prostate gland
E)semen; seminiferous gland

Question 44

have 46 chromosomes, whereas have 23.

A)Spermatids; spermatozoa
B)Primary spermatocytes; spermatids
C)Secondary spermatocytes; primary spermatocytes
D)Spermatogonia; primary spermatocytes
E)Type A spermatogonia; type B spermatogonia

Question 45

In the process of spermiogenesis, become .

A)spermatocytes; spermatozoa
B)spermatozoa; spermatids
C)spermatogonia; spermatocytes
D)spermatocytes; spermatids
E)spermatids; spermatozoa

Question 46

In meiosis, each parent cell produces

A)two haploid cells.
B)four haploid cells.
C)two diploid cells.
D)four diploid cells.
E)haploid cells identical to the parent cell.

Question 47

Changes called male climacteric are a consequence of

A)increased secretion of estrogens.
B)increased secretion of progesterone.
C)decreased secretion of testosterone.
D)increased secretion of FSH and LH.
E)increased secretion of GnRH.

Question 48

The most important role of meiosis in sexual reproduction is

A)that it reduces the size of the gametes.
B)that it produces at least one gamete that is mobile.
C)that it prevents the chromosome number from doubling in each generation.
D)that it ensures that each daughter cell doubles the number of chromosomes.
E)that it changes the genetic composition of each chromosome.

Question 49

Dilation of the causes the lacunae to fill with blood and the penis to become erect.

A)helicine arteries
B)internal pudendal (penile) arteries
C)dorsal arteries
D)dorsal veins
E)deep arteries

Question 50

At what stage does a developing sperm cell begin to grow a tail?

A)spermatozoon
B)spermatid
C)primary spermatocyte
D)secondary spermatocyte
E)spermatogonium

Question 51

A sperm count any lower than million sperm per mL of semen is usually associated with infertility (sterility).

A)250 to 500
B)200 to 250
C)100 to 200
D)50 to 100
E)20 to 25

Question 52

This image shows spermatogenesis.What does "3" represent?

A)spermatogonium
B)secondary spermatocyte
C)primary spermatocyte
D)spermatid
E)sperm

Question 53

As a result of spermatogenesis and spermiogenesis, the final cells produced are called , but they and all the stages leading up to them can be called .

A)sperm cells; interstitial cells
B)sperm cells; sustentacular cells
C)secondary spermatocytes; spermatocytes in general
D)secondary spermatocytes; germ cells
E)gametes; germ cells

Question 54

Which hormone suppresses spermatogenesis without affecting testosterone secretion?

A)gonadotropin-releasing hormone (GnRH)
B)testosterone itself
C)inhibin
D)luteinizing hormone (LH)
E)follicle-stimulating hormone (FSH)

Question 55

Sildenafil (Viagra) prolongs erection by

A)activating nitric oxide (NO) production.
B)inactivating guanylate cyclase.
C)stimulating production of cGMP.
D)inhibiting degradation of cGMP.
E)inhibiting nitric oxide (NO) production.

Question 56

Testosterone inhibits

A)libido.
B)development of secondary sex organs.
C)development of secondary sex characteristics.
D)gonadotropin-releasing hormone (GnRH) secretion.
E)sperm production.

Question 57

At the end of meiosis I there are , whereas at the end of meiosis II there is/are .

A)two diploid cells; one diploid cell
B)two diploid cells; one haploid cell
C)two diploid cells; four haploid cells
D)two haploid cells; four haploid cells
E)two haploid cells; one diploid cell

Question 58

The acrosome contains enzymes used to

A)dissolve the mucosa of the vagina.
B)dissolve the mucosa of the uterus.
C)dissolve the stickiness of the semen.
D)penetrate the vagina.
E)penetrate barriers surrounding the ovum.

Question 59

The orgasm-emission phase of the male sexual response is stimulated by

A)efferent sympathetic signals from the sacral region of the spinal cord.
B)efferent sympathetic signals from the lumbar region of the spinal cord.
C)efferent parasympathetic signals from the sacral region of the spinal cord.
D)efferent parasympathetic signals from the lumbar region of the spinal cord.
E)efferent somatic signals from the thoracic region of the spinal cord.