Textbook Quiz - Development System Flashcards
The intervillous spaces of the placenta
- are derived from the chorion
- contain maternal blood
- are rich in hCG and HCS
- enlarge under the influence of relaxin
contain maternal blood
when does the trophoblast develops into two layers
after implantation
when do the arm and leg buds form and the heart is beating?
by the end of the first month of gestation
After implantation, the only tissue of the developing embryo to come in direct contact with maternal tissue is the
trophoblast
Functional changes that sperm undergo in the female reproductive tract will allow them to fertilize a secondary oocyte are termed
capacitation
implantation is the process where the
blastocyst attaches to and enters the endometrium
implantation occurs how long after fertilization
about 6 days
The developing embryo is surrounded by and bathed in
amniotic fluid
the embryonic portion of the placenta develops from the
chorion
In the umbilical cord, there are how many arteries and how many veins
two arteries that carry deoxygenated blood and one vein that carries oxygenated blood
The testes have descended into the scrotal sac of a male fetus that is
full-term
What is an agent that causes developmental defects in the embryo called?
teratogen
Amniocentesis can produce results that indicate
the presence of certain genetic disorders such as Down syndrome
Early pregnancy tests depend on the detection of __ in the urine
human chorionic gonadotropin (hCG)
Chorionic villi sampling (CVS), although riskier, has an advantage over amniocentesis because CVS
yields test results in a few days
At the end of a full-term pregnancy, the top of the uterus reaches
nearly to the xyphoid process of the sternum
The placental stage of labor ends with
expelling of the after birth
If pregnancy continues for 2 weeks beyond the due date, there is a chance of brain damage to the fetus because of
an aging placenta
Which of the following is NOT a change that occurs after birth, as a fetus becomes a newborn baby?
- the lungs fill with air for the first time
- the umbilical arteries fill with a connective tissue
- the ductus arteriosus provides a connection to the inferior vena cava
- foramen ovale closes and becomes the fossa ovalis
the ductus arteriosus provides a connection to the inferior vena cava
In what process, does the uterine smooth muscle returns to its normal size more rapidly in nursing than non-nursing mothers
process of lactation
A hormone called ___, released from the anterior pituitary gland stimulates the production of milk by the mammary glands
prolactin
If a man with hemophilia marries a woman who does not carry the hemophilia gene, which of the following concerning their children is probable?
- all of the sons will be carriers
- all of the sons will have hemophilia
- all of the daughters will be carriers
- one half of the sons will have hemophilia and one half will be carriers
all of the daughters will be carriers
A mother will blood type B and a father with blood type A have four children. One child is type AB, one is A, one is B, and one is type O. Which of the following represents the genotypes of the parents?
IA i x IB i
The phenotype of an individual refers to the
physical or outward expression of a gene
If a couple are both heterozygous for the gene that cause PKU, the probability that their child will have PKU is
25%
Sickle-cell disease is an example of
incomplete dominance
How many alleles are present in humans that produce the phenotype of the four blood types of the ABO blood groups?
three
Am embryo develops into a normal baby girl because it
lacks the SRY gene
The gene for red-green colorblindness is represented by the symbol ‘c’. The normal allele is represented by ‘C’. An individual with the genotype XC Xc would be a
normal carrier female
Fertilization in a laboratory dish and transfer of the developing embryo into the uterus is called
in vitro fertilization (IVF)
