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24 terms

nrsi 211 chapter 6

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autosome
Any of the 22 pairs of chromosomes other than the sex chromosomes.
conceptus
Cells and membranes resulting from fertilization of the ovum at any stage of prenatal development.
corpus luteum
Graafian follicle cells remaining after ovulation that produce estrogen and progesterone.
diploid
The number of chromosomes (46 in humans) normally present in body cells other than gametes that represents 1 copy of every chromosome from each parent.
ejaculation
Expulsion of semen from the penis.
embryo
The developing baby from the beginning of the third week through the eighth week after conception.
endometrium
Lining of the uterus.
fertilization age
Prenatal age of the developing baby, calculated from the date of conception (Also called postconceptional age).
fetus
The developing baby from 9 weeks after conception until birth; used in everyday practice to describe a developing baby during pregnancy, regardless of gestational age.
gamete
Reproductive cell; in the female an ovum and in the male a spermatozoon.
gestational age
Prenatal age of the developing baby (measured in weeks) calculated from the first day of the woman's last menstrual period; approximately 2 weeks longer than the fertilization age (Also called menstrual age).
graafian follicle
A small sac within the ovary that contains the maturing ovum.
haploid
Normal number of chromosomes in male or female gamete; refers to 1 copy of a chromosome from each pair (23 in humans, or half the diploid number).
meiosis
Reduction cell division in gametes that halves the number of chromosomes in each cell.
mitosis
Cell division in body cells other than the gametes.
nidation
Implantation of the fertilized ovum (zygote) in the uterine endometrium.
oogenesis
Formation of gametes (ova) in the female.
ovulation
Release of the mature ovum from the ovary.
placenta
Fetal structure that provides nourishment and removes wastes from the developing baby and secretes hormones necessary for the continuation of pregnancy.
sex chromosome
The X or Y chromosome. Females have two X chromosomes; males have one X and one Y chromosome.
somatic cells
Body cells other than the gametes, or germ cells.
spermatogenesis
Formation of male gametes (sperm) in the testes.
teratogen
An agent that can cause defects in a developing baby during pregnancy.
zygote
The developing baby from conception through the first week of prenatal life.