Module 1 review questions Flashcards
A summary of a woman’s pregnancy outcomes.
Gravidity
a hormone produced by the corpus luteum and the placenta
progesterone
male gamete
spermatazoon
a structure within the cavity of the blastocyst, which provides nourishment to the embryo and produces its first blood cells; the secondary umbilical vesicle (yolk sac) is the first structure to be sonographically identified within the gest=ational sac
umbilical vesicle (synonym: yolk sac)
a single cell resulting from the fusion of two gametes
zygote
compression of the aorta and inferior vena cava by the gravid uterus resulting in symptoms of nausea, hypotension, lightheadedness, and syncope
aortocaval compression syndrome
pregnancy outside of the uterus
ectopic pregnancy
the amount of transmitted energy by the ultrasound beam. The higher the frequency, the lower the MI, thus, the lower the frequency, the higher the MI
mechanical indices
condition where the placenta implantation is low in the uterus and will deliver before the fetus
placenta previa
the output power indication of the amount of acoustic power it takes to raise the temperature of tissue by 1 degree celcius
thermal indices
entrapment of the umbilical cord between presenting fetal par and the cervix
vasa previa
principle minimizing the risk of ultrasound-induced bioeffects by controlling acoustic output, scan modes, machine settings, and duration of exposure
ALARA
the membrane enclosing the amniotic cavity and embryo or fetus
amnion
an early gestation consisting of a thin outer layer of cells (trophoblast), a fluid-filled cavity, and an inner cell mass (embryoblast)
blastocyst
the membrane around the chorionic cavity, made up of trophoblast cells and extraembryonic mesoderm
chorion
bud-like outward growths from the trophoblast, some of which will give rise to the fetal portion of the placenta
chorionic villi
The duration of pregnancy, counted from fertilization (conception), expressed in hours or days, also called embryonic age or postovulatory age
conceptual age
The product of fertilization, including all stages from zygote fetus
conceptus
The progesterone-secreting structure formed by a follicle after releasing its oocyte
corpus luteum
measurement of the longest axis of an embryo to determine gestational age
crown-rump length
Due dated calculated by adding 280 days to the first day of the last menstrual period (LMP); also called estimated date of confinement (EDC)
estimated due date (EDD)
Changes in the endometrium to allow implantation of a blastocyst
decidualization
A group of hormones, primarily produced in the ovaries, which affect secondary sex characteristics and the menstrual cycle
estrogen
penetration of an oocyte by a sperm to form a diploid zygote
fertilization
