Download BIOLOGY 12 MALE REPRODUCTIVE SYSTEM

Name: _____________________________
Pages: 416-419
Date: ______________
BIOLOGY 12
MALE REPRODUCTIVE SYSTEM
1) Label the following diagrams:
1) Rectum
2) Urinary bladder
3) Seminal Vesicle
4) Prostate gland
5) Bulbourethral gland (Cowper’s)
6) Epididymis
7) Testis (testes = plural)
8) Scrotum
9) Penis
10) Urethra
11) Vas deferens
Male Reproductive System↑
1) Urinary bladder
2) seminal vesicle
3) vas deferens
4) prostate gland
5) bulbourethral gland
6) urethra
7) epididymis
8) seminiferous tubules
9) interstitial cells
10) penis
11) testis
12) scrotum
Male Reproductive/Urinary System↑
13) epididymis
W) head (contains chromosomes)
X) acrosome (enzymes for entering egg)
Sperm→
Y) midpiece (mitochondria for energy)
Z) tail (movement)
2) What is the difference between semen and seminal fluid? List the contents of semen in a
chart that indicates the function of each component and the gland or structure that
produces it.
Seminal fluid = secretions from seminal vesicles, prostate gland and bulbourethral gland
Semen = sperm + seminal fluid
GLAND/
STRUCTURE
testes
CONTENT
FUNCTION
sperm
Fertilize the egg
fructose
nourish sperm
milky alkaline
fluid
helps sperm survive in the acidic vaginal canal
lubricant
aids in sperm motility
seminal
vesicles
prostate
gland
bulbourethral
gland
3) Describe the process of spermatogenesis. Be sure to indicate precisely where it occurs in
the testes, and the functions of the hormones LH, FSH and testosterone in its production.
Within the seminiferous tubules the spermatagonia divide by mitosis and become primary
spermatocytes. Primary spermatocytes divide by meiosis (46 chromosomes 23
chromosomes) to become spermatids (immature sperm). Spermatids are nourished by
the seritoli cells and develop to become functional sperm. Mature sperm are stored in
the epididymis.
FSH acts on spermatogenic cells within the seminiferous tubules to causing them to take in
testosterone.
LH act on the interstitial cells causing them to produce testosterone
Testosterone acts on spermatogenic cells causing them to produce sperm (promotes
spermatogenesis)
4) List in order the path of a single sperm cell from a seminiferous tubule to the urethral
opening.
Seminiferous tubule interstitial cells epididymis vas deferens urethra urethral
opening
5) Create a flow chart which summarizes hormonal control of the testes. Then, in a concise but
thorough paragraph, describe the control of testosterone levels by the endocrine system.
Be sure, in your description, to explain the roles of the hypothalamus, pituitary, GnRH,
LH(ICSH), FSH, interstitial cells, testosterone, and inhibin. Be sure to clearly indicate how
negative feedback operates in this loop.
See Notes p. 3 and text book p. 419
PART
6) What is the location, structure and function of the following parts of the Male
Reproductive System?
LOCATION
STRUCFUNCTION
TURE
Testis
In scrotum
Ball
Male gonads which produce sperm
and testosterone
Scrotum
Hang
underneath
penis outside
male’s body
Sac
Hold testes away from body (body
temperature is too high for sperm)
Seminiferous
tubules
Within each
testis
3 coiled Where sperm is produced
tubules (meiosis)
Interstitial cells
Lie between
the
seminiferous
tubules
In the
seminiferous
tubules
On top of
each testis
Cells
Produce testosterone
Cells
Support, nourish and regulate the
spermatogenic cells
Tubular
storage
sac
Tube
Where sperm mature
Pair of organs that that each have
a duct to join to each vas deferens
Produce secretion containing
fructose to nourish sperm
Secretes a milky alkaline fluid that
helps sperm survive in the acidic
vaginal canal
Sertoli cells
Epididymis
Vas deferens
From
epididymis to
urethra
Seminal vesicles
Join to each
vas deferens
Tube
Prostate gland
Surround
upper part of
urethra just
below bladder
Doughn
ut
shaped
organ
Carries sperm from epididymis to
urethra during ejaculation
Urethra
From urinary
bladder;
within penis
Bulbourethral
glands
Below the
Peaprostate gland sized
on either side organ
of urethra
Penis
Cylindrical
shaped organ
Hypothalamus
Part of brain
Anterior
pituitary gland
Part of brain
Tube
Carries urine from bladder during
urination
Carries semen during ejaculation
(never both at same time)
Supplies lubricant to seminal fluid/
semen
Hangs
Sexual intercourse
in front Increased blood flow causes it to
of
become erect
scrotum
Controls release of sex hormones
Releases GnRH to anterior
pituitary
Releases FSH and LH/ICSH for
spermatogenesis