One day before conception the woman ovulates and produces one mature ovum. During the conception process one sperm out of millions by the man may penetrate the outside layer of the ovum and fertilize it. The start of pregnancy is about 10 days after conception. 14 days after conception it has now developed into the fetus central nervous system. Its heart begins to beat and at this time the woman might have noticed that her menstrual period is late.
CONCEPTION PHYSICAL Conception is the beginning of human development and happens when the sperm meets an egg. In the first month, the first two weeks will be the embryo attaching itself to the uterine wall. After 25 days, the baby’s body will start to develop (only the head, followed by the trunk and arm buds). The heart will also start beating. By 30 days, the baby will be a quarter of an inch long.
It is the physical condition in which a woman’s body is nurturing a developing embryo or foetus. STAGES OF PRENATAL DEVELOPMENT. Germinal stage This stage covers two weeks after fertilization. The zygote undergoes rapid cell division then migrates slowly down the mother’s fallopian tube and is implanted in the uterine wall. The placenta begins to form enabling the developing zygote to attach itself to the mother’s uterine wall.
Consequently, they mate and touch one another regularly. It takes many years for chimpanzees to reach sexual maturity, and when they do, they begin to exhibit mating behavior. A female is able to mate about every 34 to 36 days. When a female chimpanzee is ready to mate, the skin around her bottom swells and turns pink. The swelling will be there for about ten days before becoming flabby and then shrinking away again.
The sequence of puberty, from breast development, growth of pubic hair, growing, appearance of acne, to complete physical maturation, may take a year and a half or last as long as 6 years. For males, puberty can start as early as 9 years of age to as late as 14 years of age. The sequence of puberty, from growth of pubic hair, growing, possible breast development, voice change, growing of body hair, appearance of acne, to complete physical maturation, may take 2 to 5 years for males. From here the child will grow into a young adult and quickly grow out of he innocent and ignorant child he/she started off as. As the child dances to this age, he/she will soon begin to take his/her individuality and responsibility.
Rudolfe Schaffer and Peggy Emerson (1964) studied sixty babies at monthly intervals for the first eighteen months of life; and a regular pattern was identified in the development of attachment (Hardy, S. 1995). They discovered that attachment developed in the following sequence:- Birth to six months - this is the indiscriminate attachment phase, the newborn is predisposed to attach to any human; most babies respond equally to any caregiver. After four months - preference for certain people; infants learn to distinguish primary and secondary caregivers, but still except care from anyone. After seven months - special preference for a single attachment figure; the baby looks to particular people for security and comfort; they show fear of strangers and unhappiness when separated from a special person. After nine months – multiple attachment; the baby becomes increasingly independent and forms several attachments.
Females migrate to the anus and ovideposit eggs in the perianal area. The females die after laying their eggs. The time period from ingestion of infective eggs to the ovideposition of eggs by females is approximately one month. The larvae develop and the eggs become infection within 4-6 hours. Diagnosis The most common means of diagnosing pinworm infection is via the “Scotch tape” test, where a clear adhesive cellulose tape is applied to the anal area early in the morning before bathing or defecation.
Embryonic Stem Cell Research A stem cell is a type of cell that can give rise to more cells of its kind, with at least one type of specialized cell. Human bodies possess different kinds of stem cells in different stages of life, and embryonic stem cells exist only in the first few weeks of human life, when humans are embryos. Embryos are fertilized eggs formed when a human egg and sperm fuse together and begin to undergo cell division. After about five days from the first division embryos develop into a hollowed-out ball of fluid that contains around 150 cells called a blastocyst. A part of the blastocyst will become the placenta, which will serve to nurture the growing embryo.
Physical Development Physical development includes motor skills, co-ordination and the influence of hormones. Infancy ( 0-3) Human development begins after the union of male and female gametes or germ cells during a process known as fertilization (conception). When this happens only half of the fertilised eggs become babies. 3 days after fertilisation the egg is the size of a pin head and becomes embedded in the uterus. Labour begins when a women’s water break, this is the amniotic fluid that protects the baby.
For fertilization to take place, sperm must be present either a couple of days prior to or on the day of ovulation. Sperm must first cross the barrier of the cervix, which will be thin and watery if the woman has just ovulated. Once the sperm have traversed the cervical mucus, they travel up the moist lining of the uterus into the Fallopian tubes. Since only one of the Fallopian tubes contains an egg, many sperm travel in the wrong direction. Fewer than 1,000 sperm out of the millions in the semen reach the Fallopian tubes, and only a few dozen actually reach the membrane of the egg.