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Sexualreproduction in man

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Human reproduction is any form of sexual reproduction resulting in human fertilizationtypically involving sexual intercourse between a man and a woman. During sexual intercourse, the interaction between "Sexualreproduction in man" male and female reproductive systems results in fertilization of the woman's ovum by the man's sperm.

These are specialized reproductive cells called gametesSexualreproduction in man in a process called meiosis. While normal cells contains 46 chromosomes23 pairs, gamete cells only contain 23 chromosomes, and it is when these two cells merge into one zygote cell that genetic recombination occurs and the new zygote contains 23 chromosomes from each parent, giving them 23 pairs. After a gestation periodtypically for nine months, is followed by childbirth. The fertilization of the ovum may be achieved by artificial insemination methods, which do not involve sexual intercourse.

The male reproductive system contains two main divisions: In humans, both of these organs are outside the abdominal Sexualreproduction in man. This is why the testes are carried in an external pouch viz. The female reproductive system likewise contains two main divisions: The ovum meets with sperm cella sperm may penetrate and merge with the egg, fertilizing it with the help of certain hydrolytic enzymes present in the acrosome.

The fertilization usually occurs in the oviductsbut can happen in the uterus itself.

Human reproduction is any form...

The zygote then becomes implanted in the lining of the uterus, where it begins the processes of embryogenesis and morphogenesis. When the fetus Sexualreproduction in man developed enough to survive outside of the uterusthe cervix dilates and contractions of the uterus propel it through the birth canal, which is the vagina. The ova, which are the female sex cells, are much larger than the spermatozoon and are normally formed within the ovaries of the female fetus before its birth.

They are mostly fixed in location within the ovary until their transit to the uterus, and contain nutrients for the later zygote and embryo. Over a, usually, regular interval known as the menstrual cyclein response to hormonal "Sexualreproduction in man," a process of oogenesis matures one ovum which is released and sent down the Fallopian tube. If not fertilized, this egg is flushed out of the system through menstruation.

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Human reproduction normally begins with copulation, followed by nine months of pregnancy before childbirth, though it may be achieved through artificial "Sexualreproduction in man." Many years of parental care are required before a human child becomes independent, typically between twelve and eighteen or more.

Pregnancy can be avoided with the use of contraceptives such as condoms and Intrauterine devices. Human reproduction naturally takes place as internal fertilization by sexual intercourse. During this process, the male inserts his penis, which needs to be erectinto the female's vaginaand then either partner initiates rhythmic pelvic thrusts until Sexualreproduction in man male ejaculates semen, which contains sperm, into the vaginal canal. This process is also known as "coitus", "mating", "having sex", or, euphemistically"making love".

The sperm and the ovum are known as gametes each containing half the genetic information of the parent, created through meiosis. The sperm being one of approximately million sperm in a typical male ejaculation travels through the vagina and cervix into the uterus or Fallopian tubes.

Only 1 in 14 million of the ejaculated sperm will reach the Fallopian tube. The egg simultaneously moves through the Fallopian tube away from the ovary. One of the sperm encounters, Sexualreproduction in man and fertilizes the ovum, creating a Sexualreproduction in man. Upon fertilization and implantationgestation of the fetus then occurs within the female's uterus.

Pregnancy rates for sexual intercourse are highest during the menstrual cycle time from some 5 days before until 1 to 2 days after ovulation. As an alternative to natural sexual intercourse, there are many methods of assisted reproductive technologysuch as artificial insemination where sperm is introduced into the female reproductive system without sexual intercourse. Another method of assisted reproductive technology is in vitro fertilizationwhere one or more egg cells are retrieved from a woman's ovaries and co-incubated with sperm outside the body.

The resulting embryo can then be reinserted into the Sexualreproduction in man womb. Pregnancy is the period of time during which the fetus develops, dividing via mitosis inside the female.

During this time, the fetus receives all of its nutrition and oxygenated blood from the female, filtered through the placentawhich is attached to the fetus' abdomen via an "Sexualreproduction in man" cord. This drain of nutrients can be quite taxing on the female, who is required to ingest slightly higher levels of calories. In addition, certain vitamins and other nutrients are required in greater quantities than normal, often creating abnormal eating habits.

Understanding the science of sexual...

Gestation period is about days in humans. While in the uterus, the baby first endures a very brief zygote stage, then the embryonic Sexualreproduction in man, which is marked by the development of major organs and lasts for approximately eight weeks, then the fetal stage, which revolves around the development of bone cells while the fetus continues to grow in size.

Once the fetus is sufficiently developed, chemical signals begin the "Sexualreproduction in man" of birth, which begins with the fetus being pushed out of the birthing canal. The newborn, which is called an infant in humans, should typically begin respiration on its own shortly after birth. Not long after, the placenta eventually falls off on its own. The person assisting the birth may also sever the umbilical cord.

A human baby is nearly helpless and the growing Sexualreproduction in man requires high levels of parental care for many years. One important type of early parental care is lactationfeeding the baby milk from the mother's mammary glands in her breasts. From Wikipedia, the free encyclopedia. For other uses, see Process of Reproduction journal.

Human male reproductive system. Heat mutagenesis in bacteriophage T4: Retrieved May 8, The Regents of The University of California. Complete Fertility Centre Southampton. Ovulation, Fertilization, and More". Taking Charge of Your Fertility Revised ed. National Institute for Health and Care Excellence.

Perspectives and Connections Second ed. Kimball's Biology Pages, and online textbook. Birth control Natural family planning Pre-conception counseling.

The Role of the Male

Assisted reproductive technology Artificial insemination Fertility medication In vitro fertilisation Fertility awareness Unintended pregnancy. Amniotic fluid Amniotic sac Endometrium Placenta.

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