what is reproduction in humans

Human reproduction normally begins with copulation, followed by nine months of pregnancy before childbirth, though it may be achieved through artificial insemination. At birth the organs appropriate to each sex have developed and are in their adult positions but are not functioning. Besides producing the germ cells, or gametes, the ovaries and testes are the source of hormones that cause full development of secondary sexual characteristics and also the proper functioning of the reproductive tracts. There are a number of different species-specific female hormonal cycles which can regulate reproduction. Emeritus Professor of Anatomy, University of Cambridge. In humans, gametes are produced in the male and female gonads. Human reproduction normally begins with copulation, followed by nine months of pregnancy before childbirth, though it may be achieved through artificial insemination. In females the mesonephric ducts are largely suppressed. Organs and structures of the male and female reproductive systems. Human reproduction The human reproductive system is different in males and females. Many years of parental care are required before a human child becomes independent, typically between twelve and eighteen or more. At copulation, or sexual intercourse, the erect penis is inserted into the vagina, and spermatozoa contained in the seminal fluid (semen) are ejaculated into the female genital tract. Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. Ring in the new year with a Britannica Membership, The prostate gland, seminal vesicles, and bulbourethral glands, https://www.britannica.com/science/human-reproductive-system, reproductive system - Children's Encyclopedia (Ages 8-11), reproductive system - Student Encyclopedia (Ages 11 and up). The human reproductive system takes in the role of the male and the fe male reproductive system. During sexual intercourse, the interaction between the male and female reproductive systems results in fertilization of the woman's ovum by the man's sperm. These tracts comprise the fallopian tubes, the uterus, the vagina, and associated structures in females and the penis, the sperm channels (epididymis, ductus deferens, and ejaculatory ducts), and other related structures and glands in males. The ovum meets with sperm cell, a sperm may penetrate and merge with the egg, fertilizing it with the help of certain hydrolytic enzymes present in the acrosome. Articles from Britannica Encyclopedias for elementary and high school students. Reproduction in some species leads to deadly competition between males.• The costs of sexual reproduction however clearly outweigh the costs as reflected by the fact that nearly all eukaryotic organisms reproduce sexually. A human baby is nearly helpless and the growing child requires high levels of parental care for many years. DIFFERENT 1 : IT need wind or insect to help it to reproduce The fertilization of human embryo occurs inside the body of the female. This articles describes the organs, both male and female, that are involved in human reproduction. 1. Pregnancy can be avoided with the use of contraceptives such as condoms and Intrauterine devices. Let us know if you have suggestions to improve this article (requires login). Thus, it is called Internal Fertilization. Sexual Reproduction: Sexual reproduction is the process by which offspring is produced when two gametes come together and forming a zygote. Human reproductive system, organ system by which humans reproduce and bear live offspring. Human reproduction is any form of sexual reproduction resulting in human fertilization. Once the fetus is sufficiently developed, chemical signals begin the process of birth, which begins with the fetus being pushed out of the birthing canal. Humans look a bit like each of their parents. Human Reproductive System. The reproductive tissues of male and female humans develop similarly in utero until about the seventh week of gestation when a low level of the hormone testosterone is released from the gonads of the developing male. Puberty marks the onset of increased activity in the sex glands and the steady development of secondary sexual characteristics. Internal fertilization: In this type of fertilization, the fusion of male and female gametes occurs inside the female’s body. Here is a term paper on ‘Sexual Reproduction in Human Beings’ for class 9, 10, 11 and 12. The function of the fallopian tube is to convey an ovum, which is fertilized in the tube, to the uterus, where gestation (development before birth) takes place. Puberty is the stage in the human life cycle when the sexual organs mature and prepare for reproduction. Each time a cell divides, it makes a copy of all of its chromosomes, which are tightly coiled strands of DNA, the genetic material that holds the instructions for all life, and sends an identical copy to the new cell that is created.This is a process called Mitosis, and can be found in greater detail by following the link. The breasts develop, and there is a deposition of body fat in accordance with the usual contours of the mature female. [2][3][4][5], Pregnancy rates for sexual intercourse are highest during the menstrual cycle time from some 5 days before until 1 to 2 days after ovulation. For this biological process to be carried out, certain organs and structures are required in both the male and the female. - Andrew H. Knoll The moment you would read the above quote, based on your understanding of living organisms, biomolecules and physiological processes, it would strike your brain that reproduction is a quintessential process of living beings. One important type of early parental care is lactation, feeding the baby milk from the mother's mammary glands in her breasts. Reproduction in human beings is by sexual reproduction where both the male and female gametes fertilize to give rise to an embryo. Growth of axillary (armpit) and pubic hair is more abundant, and the hair becomes thicker. Provided all organs are present, normally constructed, and functioning properly, the essential features of human reproduction are (1) liberation of an ovum, or egg, at a specific time in the reproductive cycle, (2) internal fertilization of the ovum by spermatozoa, or sperm cells, (3) transport of the fertilized ovum to the … Asexual reproduction allows humans to grow from a single cell to a baby made of trillions of cells. If not fertilized, this egg is flushed out of the system through menstruation. Sexual Reproduction in humans In sexual reproduction in animals, there are 2 parents: male and female. In humans, both of these organs are outside the abdominal cavity. Sexual reproduction is the formation of a new individual following the union of two gametes. This is because they share genetic information with both of them. REPRODUCTION IN HUMANS 2.1. Marked changes in height and weight occur as hormonal secretion from the testes increases. They are the parents of the future offspring. During childhood until puberty there is steady growth in all reproductive organs and a gradual development of activity. In animals, sexual reproduction encompasses the fusion of two distinct gametes (sex cells) to form a zygote. The female gamete or sex cell is called ovum or egg(It contains water,stored food and nucleus). Certain features in the skeleton, as seen in the pelvic bones and skull, become accentuated. 37 °C. The person assisting the birth may also sever the umbilical cord. Reproduction ensures the continuation of similar kinds of individuals, generation after generation. DIFFERENT 1:We reproduce sexually. It typically involves sexual intercourse between a man and a woman. 2. Human Beings are viviparous organisms who give rise to Embryos directly instead of laying eggs. The zygote then becomes implanted in the lining of the uterus, where it begins the processes of embryogenesis and morphogenesis. In a general sense reproduction is one of the most important concepts in biology: it means making a copy, a likeness, and thereby providing for the continued existence of species. The larynx, or voice box, enlarges, with resultant deepening of the voice. This means without it, humans will no longer exist, as there … The newborn, which is called an infant in humans, should typically begin respiration on its own shortly after birth. Gestation period is about 266 days in humans. It's that growth and reproduction, the ability to make more of yourself, that's important. This drain of nutrients can be quite taxing on the female, who is required to ingest slightly higher levels of calories. Moreover, reproducing sexually gives the benefit of variation and offsprings are unique. Reproduction in human beings The male gamete or sex cell is called sperm(it has long tail,motile and can move independently). In humans and the majority of other eukaryotes — plants as well as animals — the two gametes differ in structure ("anisogamy") and are contributed by different parents. For a description of the stages of labour and delivery, see parturition. 2.2. Pregnancy is the period of time during which the fetus develops, dividing via mitosis inside the female. The following is an excerpt from The End of Sex and the Future of Human Reproduction by Henry T. Greely.. Please refer to the appropriate style manual or other sources if you have any questions. The periodicity is manifested by menstruation at intervals of about 28 days; important changes occur in the ovaries and uterus during each reproductive, or menstrual, cycle. When the fetus is developed enough to survive outside of the uterus, the cervix dilates and contractions of the uterus propel it through the birth canal, which is the vagina. Although the replicative life cycle of viruses differs greatly between species and category of virus, there are six basic stages that are essential for viral replication. Differentiation of the external genitalia in the human embryo and fetus. The reproductive process itself is covered in other articles. There is, however, no external indication of the sex of an embryo during the first eight weeks of its life within the uterus. Facial hair develops, as well as hair on the chest, abdomen, and limbs. This is why the testes are carried in an external pouch viz. Spermatozoa then pass from the vagina through the uterus to the fallopian tube to fertilize the ovum in the outer part of the tube. I think you can say that life is a system in which proteins and nucleic acids interact in ways that allow the structure to grow and reproduce. Fertilisation is the fusion of the nucleus of a male gamete with the nucleus of a female gamete, producing a new cell called a zygote. This page was last edited on 27 January 2021, at 11:33. The sex of a child is determined at the time of fertilization of the ovum by the spermatozoon. Reproduction in Human Beings. One of the sperm encounters, penetrates and fertilizes the ovum, creating a zygote. This type of reproduction is more complex and lengthy as compared to asexual reproduction. Testosterone causes the primitive gonads to differentiate into male sexual organs. These are specialized reproductive cells called gametes, created in a process called meiosis. As you continue to grow, your body makes more cells. Reproduction is necessary for continuity of humans. Reproduction in humans is a complex process and the human reproductive system has a vital role in it. This is a book about the future of our species, about the likely development of revolutionary biological technologies, and about the deep ethical and … 4. Fusion of egg and sperm give rise to a single cell called ZYGOTE. The hair in the armpits and the pubic hair becomes abundant and thicker. Upon fertilization and implantation, gestation of the fetus then occurs within the female's uterus. Asexual reproduction simply means “without the immediate use of fertilization”; it is the combining of parts of a human sperm, egg, embryo, or synthetic genes to reproduce a new human embryo. During this time, the fetus receives all of its nutrition and oxygenated blood from the female, filtered through the placenta, which is attached to the fetus' abdomen via an umbilical cord. The egg simultaneously moves through the Fallopian tube away from the ovary. Only 1 in 14 million of the ejaculated sperm will reach the Fallopian tube. scrotum rather than within the abdomen; they normally remain slightly cooler than body temperature, facilitating sperm production. Over a, usually, regular interval known as the menstrual cycle, in response to hormonal signals, a process of oogenesis matures one ovum which is released and sent down the Fallopian tube. Answer: The importance of reproduction in organisms is: 1. The sperm (being one of approximately 250 million sperm in a typical male ejaculation) travels through the vagina and cervix into the uterus or Fallopian tubes. Please select which sections you would like to print: While every effort has been made to follow citation style rules, there may be some discrepancies. The fertilized ovum implants itself into the uterus wall and develops into a human embryo. The male reproductive system contains two main divisions: the testes where sperm are produced, and the penis. There are also many methods of assisted reproductive technology, such as in vitro fertilization, where one or more egg cells are retrieved from a woman's ovaries and co-incubated with sperm outside the body. Hopwood, Nick, Rebecca Flemming, Lauren Kassell, eds. For a detailed discussion of the series of changes that occur in a woman’s body as her fetus develops, see pregnancy. Hair at the temples recedes. The differences between a male and a female are genetically determined by the chromosomes that each possesses in the nuclei of the cells. Human reproductive system, organ system by which humans reproduce and bear live offspring. According to the cycle of life, all organisms are born, reproduce and die. Skin glands become more active, especially apocrine glands (a type of sweat gland that is found in the armpits and groin and around the anus). Having the testes outside the abdomen facilitates temperature regulation of the sperm, which require specific temperatures to survive about 2-3 °C less than the normal body temperature i.e. Sexual Reproduction Sexual reproduction is a natural way of reproduction in humans, animals and the majority of plants also choose to reproduce sexually. You will read in this chapter that after one sperm cell enters an egg cell, other sperm cells cannot.-V i ViÊÊ-V i ViÊÊ+PVSOBM Imagine that you are a … Various abnormalities can occur during development of sex organs in embryos, leading to hermaphroditism, pseudohermaphroditism, and other chromosomally induced conditions. Mammals like cow, horse, dog, cat, and human beings are examples of organisms that … In human reproduction, two gametes (the sperm and egg cell) fuse during conception to form a zygote, that will eventually become a new baby. A gamete (/ˈɡæmiːt/; from Ancient Greek γαμετή gamete from gamein "to marry") is a haploid cell that fuses with another haploid cell during fertilization in organisms that sexually reproduce and possess only one set of dissimilar chromosomes. The next phase, one of differentiation, begins first in gonads that are to become testes and a week or so later in those destined to be ovaries. As an alternative to natural sexual intercourse, there exists artificial insemination, where sperm is introduced into the female reproductive system. The female reproductive system likewise contains two main divisions: the vagina and the Ovum. When a sperm and egg join, the egg is fertilised and a baby starts to develop. For coverage of the many diseases and disorders that can affect the reproductive organs, see reproductive system disease. 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