Presentación david human reproduction


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Presentación david human reproduction

  1. 1. Sexual reproduction is how human beings have children. SEX CHARACTERISTICS There are physical difference between male and female bodies. These differences are called sex characterstics. There are two types of sex characteristics. •Primary sex characteristics: are physical differences between male and female reproducive organs. •Secondary sex characteristics: men have got more facial hair and woman wider hips, this apparing during the puberty. The human body prepares itself for the reproductive process during a period of live called puberty. A girls breasts Her body gets rounder and her Body hair also grow under hips armsget larger. hips get wider. and in her pubic area.A boy´s His muscles get Body hair growsvoice get larger and his under his arms, ondeeper. shoulder get his chest, in his pubic wider. area and in his face.
  2. 2. There are two types of human reproductive cells: the female egg cell (ovum)and the male sperm cell ( spermatozoon). Both types of reproductive cells are also called gametes. •The female reproductive system produces egg cells in the ovaries. During puberty , a girl´s body starts to produce egg cell every 28 days. This process usually stop at 45 and 55 years old. •The male reproductive system produces sperm cell in the testicles. During puberty , a boy´s body starts to produce sperm cell, produce millions of spermEGG CELL. SPERM CELL cells all the time.
  3. 3. The female reproductive system is formed by internal (or genital) and external sex organs. The external female sex organs are called vulva: •The labia majora and labia minora protect the rest of the vulva . •The vaginal orifice. •The clitoris. the internal female sex organs: The fallopian tubes carry egg cells from the Are two almond ovaris to the uterus. shaped organs that produce egg cell. Uterus is a hollow organs whitThe vagina is a muscular walls.muscular canal thatleads from thevulva to the uterus
  4. 4. •The ovarian cycle, an egg cell start to mature inside one of the ovaries .On the 14 day of the ovarian cycle , the egg cell leaves the uterus .this iscalled ovulation.•The uterine cycle , the walls of the uterus beacome thicker of extratissue and blood. This change prepare the uterus for a fertilised an eggcell.This is called menstruation.
  5. 5. The male reproductive system produces sperm cells. It also transports thesperm cells out of a man´s body and into a woman´s reproductive system.The penis, which deposits sperm cells in the vagina.The testicles, which produce millions of sperm cells.The vas deferens, which carries these sperm cells to the urethra.The seminal vesicles and the prostate, which produce liquids to make semen;the semen is a liquid which contains nutrients to keep the sperm cells alive.The urethra, which carries the semen and the sperm cells out of the body.6.Sperm cells grow and mature inside the testicles.7.Each vas deferens transports cells to of the seminal vesicles.8.The prostate and into the urethra, along with semen.9.Finally, the semen and the sperm cells travel, out the end of the penis. Thisprocess is called ejaculation.
  6. 6. When a sperm cell fertilises an egg cell, and join to form a new cell called azygote. When the zygote develops is called fetus.To fertilise an egg cell, a man and a woman have sexual intercourse.During intercourse, the man puts his penis into the woman´s vagina anddeposits his semen, which contains millions of sperm cells.The sperm cells swim into the uterus and up the fallopian tubes. If thereis a egg cell in the fallopian tube, only one sperm cell can fertilise it.When this happens, the sperm cell and the egg cell combine and formone new cell, called a zygote.After fertilization, the zygote divides many times to form a group of cellsthis is called an embryo. After about six days, the embryo joins itself tothe wall of the uterus.
  7. 7. Pregnancy is the time between the fertilization of an egg cell and thebirth of a baby.Pregnancy last for about nine months. During this me, two specialorgans form inside the uterus: the placenta and the amniotic sac. The fetus is connected to the The amniotic sac is a thin bag placenta by the umbilical. of tissue that contains a liquid The placenta provides the called amniotic fluid. This fetus with oxygen and liquid supports the fetus and nutrients from the mother´s protects it from impacts and blood. The placenta also vibrations. takes away carbon dioxide and waste that the fetus produces.
  8. 8. Birth is when the baby leaves the uterus through the vagina. Birth happens inthree stages, the dilation of the cervix, the expulsion of the baby and theexpulsion of the afterbirth. 1First, the walls of the uterus start tocontract in a rhythmic way and the 2cervix dilates. Next, the baby is expelled through the vagina. After that, the baby starts to breathe. The doctor also knots and cuts the umbilical cord. 3 Finally, the uterus contracts again and the afterbirth is expelled.
  9. 9. David Palazón