-
process that reduces the number of chromosomes in each daughter cell to half the number present in the parent cell
meiosis
-
46 chromosomes per body cell is known as the ___number of chromosomes
diploid
-
each primary spermatocyte undergoes meiotic division 1 to form
2 haploid secondary spermatocytes
-
mature follicle ready to burst open from the ovary's surface
graafian follicle
-
fertilization occurs in the
fallopian tubes
-
phenomenon of "crossing over" takes place during
meiosis 1 only
-
True or False; sperm cells can live in the female reproductive tract for up to 3 days
true
-
about 3 days after fertilization, the zygote forms into a solid mass of cells called
morula
-
"bag of waters"
amniotic sac
-
primary germ layers
- -ectoderm
- -endoderm
- -mesoderm
-
division of cells of the zygote is called
cleavage
-
fraternal twins
arise from two different sperm and two different ova
-
period of infancy lasts approx
18 months
-
rare, inherited condition in which an individual appears to age rapidly
progeria
-
birth weight triples by
12 months
-
clouding of the lens of the eye
cataract
-
pregnancy induced hypertension
preeclampsia
-
common type of ectopic pregnancy
tubal pregnancy
-
breast inflammation
mastitis
-
childbed fever
puerperal fever
-
-
inside germ layer
endoderm
-
-
length of pregnancy
gestation
-
process of birth
parturition
-
degenerative changes in the urinary system that accompany old age include
- -decreased capacity of the bladder and the inability to empty or void completely
- -decrease in the number of nephrons
- -less blood flow through the kidneys
-
hardening of the arteries
arteriosclerosis
-
structure derived from ectoderm
brain
-
atherosclerosis
fat accumulation in arteries
-
adolescence
secondary secual characteristics
-
senescence
older adulthood
-
progeria
hutchinson-gilford disease
-
gerontology
study of aging
-
Endoderm
- -inner germ layer forming the linings of various tracts as well as several glands
- -lining of the respiratory tract and GI tract, including some of the accessory structures such as tonsils
-
Ectoderm
- -outer germ layer forming many of the structures around the periphery of the body
- -epidermis of the skin, enamel of the teeth, and cornea and lens of the eye
- -brain and spinal cord
-
Mesoderm
- -the middle germ layer forming most of the organs and other structures between those formed by the endoderm and ectoderm.
- -dermis of the skin, skeletal muscles and bones, many of the glands of the body, kidneys, gonads, components of the circulatory system
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