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Subzonal sperm insertion
Subzonal sperm insertion A variation of in-vitro fertilization in which the sperm is surgically implanted into the egg.
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Fertilization
The combining of the genetic material carried by sperm and egg to create an embryo. Normally occurs inside the fallopian tube (in vivo) but may also occur in a petri dish (in vitro).
Sperm
A sperm cell, or spermatozoon (pl. spermatozoa) (in Greek: sperm = semen and zoon = alive), is the haploid cell that is the male gamete. It is carried in fluid called semen, and is capable of fertilising an egg cell to form a zygote. A zygote can grow into a new organism, such as a human. Sperm cells contain half of the genetic information needed to create life. Generally, the sex of the offspring is determined by the sperm, through the chromosomal pair "XX" (for a female) or "XY" (for a male).
Egg
The mature female reproductive cell.
SIMILAR TERMS--------------------------------------
PREVIOUS AND NEXT TERMS--------------------------------------
Sterility
The permanent inability of a man or woman to reproduce.
Sterilization
A surgical method, such as tubal ligation for women and vasectomy for men, that renders an individual unable to reproduce.
Stillbirth
The death of a baby after 20 weeks' gestation but before birth. Stillbirths are mainly caused by genetic or congenital defects, problems with the umbilical cord or placenta, or a medical condition in the mother.
Strep throat
A bacterial infection of the throat and tonsils, treated with antibiotics. Rare in children under 3.
Stretch marks
About half of pregnant women will develop these pink or reddish streaks on their breasts, hips, or abdomen sometime during pregnancy as elastic fibers stretch and rupture in their skin. While stretch marks can't be prevented, they will fade slowly after delivery.
Subzonal sperm insertion
Sudden infant death syndrome
The death, with no clear cause, of an infant between 1 and 12 months old. Putting an infant to sleep on her back has been shown to reduce the risk of SIDS.
Surrogate mother
A woman who bears a child for a couple. Usually the surrogate is artificially inseminated with the man's sperm, though in some cases an embryo is implanted in a surrogate.
Sweat test
The standard diagnostic test for cystic fibrosis, which measures the amount of salt in a person's sweat. A high level of salt indicates cystic fibrosis.
Symbiotic stage
The early, close relationship between mother and child.
S cones
Short wavelength sensitive cones (blue). Are most sensitive to a wavelength of approximately 419nm. (See also L Cones and M Cones).
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