Sperm Production
Sperm
are produced, stored, and delivered by the male reproductive system. The male
reproductive system includes the testes, urethra, vas deferens, prostate gland,
seminal vesicle, and penis.
The
testes contain coiled structures called seminiferous tubules, which are the
sites of sperm production. They produce over 12 billion sperm per month. The
epididymis lies on top of the seminiferous tubules. Immature sperm migrate from
the seminiferous tubules to the epididymis to mature and be stored.
Before
intercourse, the penis fills with blood and becomes erect. With sufficient
stimulation, the ejaculatory process begins.
The
mature sperm travel from the epididymis through the vas deferens. The vas
deferens is a narrow, muscular tube about 18 inches long. Its smooth muscle
contractions propel the sperm forward. They arrive first at the ampulla, the
widest part of the vas deferens, and then pass into the ejaculatory ducts. In
the ejaculatory ducts, a liquid secretion from the seminal vesicles mixes with
the sperm. Seminal fluid contains fructose sugar, which the sperm use as fuel
as well as alkalines, which help to counteract the naturally acidic environment
of the vagina and uterus providing the sperm a better chance for survival.
The
liquid mixture is propelled forward through the ejaculatory ducts toward the
urethra, passing first through the prostate gland, where milky prostatic fluid
is added, forming the substance we call semen. The prostatic fluid helps the
sperm swim faster, which is important for getting to the egg cell.
Finally,
about a teaspoon of semen is ejected out (ejaculated) through the far end of
the urethra at the end of the penis. From the time the sperm leave the man’s
body, they have between 12 and 48 hours to find and fertilize the egg cell,
assuming an egg is available. Of the 300 million sperm ejaculated, only about
200 or so will survive to reach the egg cell and only one will succeed in
fertilizing it.
Vocabulary
:
- Produce : menghasilkan
- Immature : belum matang
- Migrate : berpindah tempat
- Intercourse : persetubuhan
- Sufficient : cukup
- Propel : mendorong
- Survive : bertahan
- Succeed : menggantikan
Translate
the text above into Bahasa Indonesia!
Answer
the following question according to the text!
- Which system that produce sperm?
- What is the contain of the testes?
- How many sperm which is produced in a moth?
- What will happen with penis before intercourse?
- What is the widest part of the vas deferens?
- What is the contain of Seminal fluid?
- How many time that the sperm need to find and fertilize the egg cell after leave the man’s body?
Dialog
Sperm
Production
Situation
The evening session continues with more questions from
the floor. There are speakers, Michiko from Japan, Hanum from Bangladesh, and
Zainab from Indonesia.
Michiko : excuse me, sir. Could you please
explain again about spermatogenia to us?
Speaker : alright, spermatogenia devide by
mitosis to produce more spermatogenia or differentiate into spermatocytes.
Hanum : sir, what does meiosis produce?
Speakers : well, meiosis of each spermatocyte
produce four hap-loid spermatiods.
Zainab : how long does the process take
place?
Speaker : it takes over three weeks. Ladies and
gentlemen… your paper is due tomorrow… please turn in before the coffee break…
thank you!
PART
2. QUESTIONS
1. What
is the topic of the evening session?
2. How
many participants ask questions?
3. Does
the speaker give them any written assignment?
4. When
is it due?
PART 3. MAKE A DIALOG
With your partner create a dialog with similar situation.
PART 4. EXPOSURE TO STRUCTURE
Pronouns
There are five form of
pronouns in English:
1. Subject
pronouns: I, you, we, they, he, she, it
2. Object
pronouns: me, you, us, them, him, her, it
3. Possessive
adjective: my, your, our, their, his, her, its
4. Possessive
pronouns: mine, yours, ours, theirs, his, hers, its
5. Reflexive
pronouns: myself, yourself/ yourselves, ourselves, themselves, himself,
herself, itself
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