THE MALE REPRODUCTIVE SYSTEM (OUTLINE)
http://www.cchs.net/health/health-info/docs/2300/2376.asp:
The organs of the male reproductive system are specialized for the following functions:
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To produce, maintain and transport sperm (the male reproductive cells) and protective
fluid (semen)
To discharge sperm within the female reproductive tract
To produce and secrete male sex hormones
They’re specifically designed to produce, nourish, and transport either the egg or sperm.
male has reproductive organs/genitals that are inside & outside the body.
Urethra-
the tube that transports semen and urine. The opening is at the tip of the penis.
the testicles- the two testicles, or testes, produce and store millions of tiny sperm cells. the testicles
grow to be about 2 inches (5 centimeters) in length and 1 inch (3 centimeters) in diameter. The
testicles are part of the endocrine system because they produce hormones, including testosterone. as
a guy makes his way through puberty, his testicles produce more and more of testosterone .
Testosterone is the hormone that causes boys to develop deeper voices, bigger muscles, and body
and facial hair, thicker & tougher skin, and it also stimulates the production of sperm.
the scrotum-
loose pouch-like sac of skin that hangs behind the penis. It contains the testicles (also
called testes), as well as many nerves and blood vessels. The scrotum has a protective function and acts
as a climate control system for the testes.
the epididymis-
a long, coiled tube that rests on the backside of each testicle. It functions in the
transport and storage of the sperm cells that are produced in the testes. It also is the job of the
epididymis to bring the sperm to maturity, since the sperm that emerge from the testes are immature
and incapable of fertilization.
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vas deferens-
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the seminal vesicles-
a long, muscular tube that travels from the epididymis into the pelvic cavity, to just
behind the bladder. The vas deferens transports mature sperm to the urethra, the tube that carries
urine or sperm to outside of the body, in preparation for ejaculation.
sac-like pouches that attach to the vas deferens near the base of the bladder. The
seminal vesicles produce a sugar-rich fluid (fructose) that provides sperm with a source of energy to
help them move. The fluid of the seminal vesicles makes up most of the volume of a man's ejaculatory
fluid, or ejaculate.
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prostate gland-
a walnut-sized structure that is located below the urinary bladder in front of the
rectum. The prostate gland contributes additional fluid to the ejaculate. Prostate fluids also help to
nourish the sperm. The urethra, which carries the ejaculate to be expelled during orgasm, runs through
the center of the prostate gland.
the penis- male organ for sexual intercourse. the head of the penis, is covered with a loose layer
of skin called foreskin. Filled with special, sponge-like erectile tissue that fills with blood when
the man is sexually aroused. Semen, which contains sperm, is expelled (ejaculated) through the
end of the penis when the man reaches sexual climax (orgasm). When the penis is erect, the
flow of urine is blocked from the urethra, allowing only semen to be ejaculated at orgasm.
THE MALE REPRODUCTIVE SYSTEM (DIAGRAMS)
http://www.patient.co.uk/diagram/Male-Reproductive-system.htm:
http://www.phoenix5.org/prostatedraw.html:
THE MALE REPRODUCTIVE SYSTEM (TWO-PAGE SUMMARY)
The main tasks of the male reproductive system are to
provide sex hormones, produce sperm, and transport sperm from
a male to a female.
The first two tasks are performed by the testes; while the
third job is carried out by a series of ejaculatory ducts and the
penis. The two testes are in the scrotum.
Each teste is attached to the epididymis, which contains
numerous sperm ducts. The epidiymides sends sperm through
the vas deferens to the penis. However, the seminal vesicles, and
prostate glands each contribute to the seminal fluid which carries
the sperm to the penis. The epididymides and part of the vas
deferens are in the scrotum, but the glands creating the seminal
fluid are in the abdomen.
As many as several hundred million sperm can be produced
each day. And one man has approximatelya quarter mile of coiled
semininal tubules which produce all these sperm.
The vas deferens carries concentrated sperm from the
scrotum into the ejaculatory duct. Sperm that remain in the
ejaculatory duct longer than a couple of weeks degenerate and
are disposed of. The prostate surrounds the ejaculatory duct and
contains a sphincter that closes off the bladder during ejaculation.
Seminal fluid from the seminal vesicles, and the prostate glands
is added to the sperm. The seminal fluid mixed with the sperm is
called semen.
At ejaculation, additional prostate gland secretions combine
with the remaining seminal fluid and sperm. This semen is sent
through the urethra in the penis.
The penis in its relaxed state, can’t deliver sperm. In order
for the sperm to have the best chance of fertilizing an egg, the
penis has to become erect and ejaculate semen in the female
reproductive tract.
The penis is part of the male's external reproductive system
which becomes longer, thicker, and stiff during erection. The skin
covering the penis is loose and allows for expansion during
erection.
Three erectile tissue make up the internal portion of the
penis. During erection they fill with blood.
Male orgasm results from both emission and ejaculation.
Emission is the release of the ejaculatory fluid into the urethra.
Emission is caused by increased nerve stimulation in the
ejaculatory ducts and glands which leads to contractions that
force the fluid out. For ejaculation, contractions of the urethra
expel the semen while the prostate gland closes off the bladder.
After release, blood exits the penis and testes, and the penis
relaxes. Respiration, blood pressure, and heart rate return to
normal, and sexual arousal goes down.