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Anatomy 102 > Chapter 23 > Flashcards

Chapter 23 Flashcards

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0
Q

What is the first to develop in a fetus

A

Morula

the morula is the early ball of cells that will become the blastocyst

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1
Q

Name a fact about blastomeres

A

Blastomere is an early cell type that divides by cleavage

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2
Q

Three facts about implantation

A

Involves a blastocyst the preembryo which implants
Has cells that produce HCG
Occurs by the sixth day

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3
Q

In the process of in vitro fertilization, the woman is given ? To induce follicle development

A

Human menopausal gonadotropin

HMG or related compounds will stimulate the ovary to produce follicles; HCG is then used to induce ovulation

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4
Q

The main factor that may NOT allow a 24 week fetus to survive independently is the

A

Surfactant

Surfactant is the lipid in the lungs that prevents collapse and allows the fetus to breathe; premature infants often lack this ability and must be sustained artificially until their surfactant is sufficient

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5
Q

The ductus venosus transports blood to the ?

A

Vena cava

The umbilical vein becomes the ductus venosus

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6
Q

The foramen ovale allows blood from the right atrium to enter the

A

Left atrium

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7
Q

Large amounts of blood do NOT enter r fetal lungs because their

A

Resistance is high

The resistance to blood flow in the fetal lungs is higher than the right ventricle blood flow pressure which cannot overcome the resistance to any great extent

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8
Q

The ductus arteriosclerosis allows blood to flow from the pulmonary trunk to the

A

Aorta

The ductus arteriosus is a shunt lung bypass between the pulmonary trunk and the aorta

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9
Q

What vessel transports blood rich in oxygen and nutrients to the fetus

A

Umbilical vein

The umbilical vain travels toward the heart of the fetus and is thus a vein; however it is coming from the placenta where it picked up oxygen and nutrients.

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10
Q

With in the fetus, much of the circulating blood bypasses the lungs and flow through the

A

Ductus arteriosus

The arteriosus shunts blood from the pulmonary trunk to the aorta

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11
Q

The period immediately after birth to four weeks of age is called the ? Period

A

Neonatal

The first month of extrauterine life in the neonatal period

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12
Q

Many changes occur in the newborn infant as it adapts to a life apart from its mother. What happens to the umbilical vein?

A

It closes off to become the ligamentum teres.

The umbilical vein remains as a ligament attached to the liver

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13
Q

What is the biological definition of human adulthood

A

Adolescence to old age

An adolescent is reproductively mature, and therefore is considered an adult

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14
Q

In which process do the cells become progressively smaller

A

Cleavage

Cell division takes place so rapidly during cleavage that the cells do not grow between divisions

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15
Q

When is a developing individual most susceptible to genetic birth defects from smoking

A

First trimester

The first trimester is the most critical time period in all of development

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16
Q

When is it possible to distinguish the sex of the fetus

A

Third month

The sex of the fetus begins differentiation around week 8 or 9

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17
Q

When does bone start to replace cartilage

A

Third month

Endochondral ossification and intramembranous ossification begin around week 10

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18
Q

The embryonic period lasts from the second week through ? Week

A

Eighth

The embryonic period begins when two distinct cell layers form and proceeds until around the eighth week when differentiation ends

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19
Q

Name 3 things that arise from the mesoderm

A

Muscle
Kidney
Blood

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20
Q

What prevents the maternal and embryonic blood cells from mixing

A

Placental membrane

The placental membrane is a layer of epithelial cells that separate the villi from the maternal endometrium

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21
Q

When will the embryo take on a human appearance

A

Eighth week

Human structures become evident and differentiated by the eighth week, prior to this time the embryo passes through. Stages that seem to resemble other mammals

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22
Q

Name 3 fetal component

A

Chlorion
Amnion
Umbilical cord

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23
Q

Of every 100 secondary oocytes that are exposed to sperm, how many infants are actually born alive

A

About 31

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24
When does the amnion first appear
Second week The rudimentary amnion appears in the second week and becomes fluid filled
25
What is the origin of fetal blood cells
Yolk sac The yolk sac appears in the second week and is the origin of the fetal blood cells and gametes that will migrate into the fetus
26
What is the major cell process in the fetus
Mitosis Differentiation has ended with the onset of the fetus and all growth processes are mitotic in nature
27
When can the male and female organs be distinguished first
Twelfth week By the twelfth week the external genitalia are distinguishable
28
Name 3 things true at full term
Fingernail are present Vertex position is evident Fetus is 50 cm long The testes begin to descend around the eight month but may not be completed until after birth
29
The umbilical arteries are branches of the
Internal iliac arteries
30
What has the greatest oxygen content in a fetus
Umbilical vein Umbilical Arteries are traveling to the placenta to gain oxygen from the mother
31
What system function is most critical in the neonate
Respiratory During the first month of life, the exchange of gasses is critical, the liver is one of the last organs to mature
32
Name 3 factors that causes the first breath of life
Blood pH Carbon dioxide Low blood oxygen The initiation of breathing occurs from stimulation of the brain stem, epinephrine is produced and rises because of the stress of delivery and is important for increasing the ability of the lungs to expand
33
In the first days of life, what is the primary source of energy
Lipid
34
The superior vesical arteries are remnants of the
Umbilical arteries A portion of the umbilical arteries persist in the neonate as the superior vesical arteries that supply blood to the bladder
35
The ligament teres is the remnant of the
Umbilical vein The ligamentum teres Is the fibrotic degeneration of the umbilical vein from the umbilicus to the liver
36
The ligamentum venosum is the remnant of the
Ductus venosus The ductus venosus in the liver atrophies into the closed ligamentum venosum
37
The reason why blood no longer passes through the foremen ovale is initially explained by the
Increase in left atrial pressure The increase in left atrial pressure during inspiration causes the septum primum valve to close the foremen ovale
38
The constriction of the ductus arteriosus is related most likely to
Bradykinin
39
At what age is most hemoglobin of the adult type
At four months
40
After age 30, the adult loses about ? % of their functional capacity each year
.8 It is estimated that degeneration occurs after age 30 when about .8% of their functional capabilities is lost each successive year
41
The chemical theory of aging involves the formation of
Free radicals
42
The premature separation of the placenta is
Abruptio placentae
43
Perinatology is a branch of medicine that studies the
Fetus and neonate The domain of perinatology is the 24 week fetus through first four weeks after birth
44
Name 3 things that freely cross the placental membrane
Leukocytes Glucose NaCl NOT erythrocytes. Leukocytes wander anywhere by diapedesis and chemotaxis
45
Epithelial lining of the digestive tract , respiratory tract and urethra all form from the ? Layer of the gastrula
Endoderm Lining of passageways with an external connection come from endoderm
46
The portion of the placenta contributed by the embryo is the
Chorion
47
Within which embryonic membrane are blood cells formed in the early stages of development
Yolk sac First blood cells come from yolk sac
48
At what age do age related degenerative changes begin in most adults
Age 30 "Aging" begins around 30
49
Name 3 things that aging appears to result from
Genetics Apoptosis Accumulation of free-radicals
50
What is the major cause of death in less-developed countries
Infections
51
In which menstrual cycle phase does implantation occur
Secretory Implantation occurs after ovulation which means the uterus is inits secretory stage
52
What normally prevents the expulsion of an embryo by a menstrual flow
HCG HCG causes the corpus luteum to remain, which in turn secretes progesterone thus preventing menses
53
The structure which implants in the endometrium is correctly termed a
Blastocyst
54
When can the term fetus be correctly used
When body systems have been established
55
What extra embryonic membrane encloses the embryo in a fluid filled cavity
Amnion
56
What membrane plays the greatest role in nutrient and waste exchanges
Chorion Chorion is part of the placenta
57
What hormone prevents a second pregnancy during gestation
Progesterone
58
A sudden increase. In uterine size could indicate the development of a hydatid mole T or F
True A hydatid mole or cyst is an abnormal growth of chorionic tissue that might be extensive enough to replace the fetus and even mimic pregnancy
59
The ossification of the skull is completed by full term T or F
False Although much of the skull is ossified, it will not become complete until several months after birth
60
Fetal hemoglobin is different from the adult and has a higher oxygen capacity T or F
True The hemoglobin of the fetus has a 50% greater oxygen affinity than the maternal blood which favors fetal uptake
61
All the fetal veins contain deoxygenated blood T or F
False The ductus venosus contains highly oxygenated blood from the placenta
62
Because of the ductus arteriosus, greater amounts of oxygenated blood can travel to the brain T or F
False The ductus arteriosus is connected is connected to the descending portion of the aortic arch past the branching of the arteries that convey blood to the brain
63
The number of umbilical arteries is directly related to the structure of the fetal internal circulatory system T or F
True There is a strong correlation between umbilical arteries and fetal circulation, many heart and vessel defects are associated with having only one artery, which is why the umbilical vessels are counted at birth
64
Infant respiratory distress syndrome is less common if the mother had normal labor and delivery T or F
True The contractions of the uterus seem to increase the fetal ability to secrete surfactant, babies taken by cesarean delivery may have a higher incidence of respiratory distress syndrome
65
The kidneys of a neonate are immature and therefore do not excrete large amounts of water T or F
False The kidneys are immature and do not excrete large amounts of electrolytes and thus produce a dilute urine increasing the chances for dehydration
66
The fossa ovalis is the depression in the heart that was the foramen ovale T or F
True The foramen ovale closes shortly after birth and becomes a solid depression called fossa ovalis
67
The ligamentum arteriosum forms in the neonate as a remnant of the ductus arteriosus T or F
False The process of scar formation in the replacement of the ductus arteriosus require several months to complete, the term ligamentum arteriosum is more appropriate in an adult heart
68
Heart failure is a common form of death in the first neonatal month T or F
True Failure of the ductus arteriosus to collapse will result in a deficiency of oxygen to the heart relative to a high demand
69
Childhood typically ends when the person is six years of age T or F
False Childhood is a period from one year to the time of puberty and is therefore variable, but usually falls between one year and around 11 years
70
The average female has a shorter adolescent period than males T or F
True The attainment do sexual and physical maturity occurs sooner in females, who usually attain puberty earlier
71
Females are taller and stronger than males when they are both in early adolescence T or F
True Females reach a peak earlier than males, but males develop a growth spurt in late adolescence that causes them to exceed females size and strength
72
Older persons require fewer calories and can survive well on smaller portions of food T or F
False Older persons require less calories but still require an adequate intake of vitamins, minerals and other essential nutrients which may not be present in a typical small portion of food
73
Older persons have a reduced capacity to prevent infection T or F
True The immune system slowly degenerates along with others causing a reduction in the ability to produce antibodies and phagocytic cells
74
Senescence usually ends in death because of neurological changes and degeneration T or F
False Death usually results from failures and degenerative changes in the cardiovascular system, a person may have brain death but still remain alive
75
The human life span and life expectancy have both increased in the last one thousand years T or F
False Although the life expectancy has generally increased for the total population because of technology and medical care, the theoretical point of death has not increased
76
Collagen synthesis decreases with age and the collagen molecules become soft and degenerated T or F
False The collagen fibers actually form cross- links and become stiffer and less flexible, contributing to the dysfunctions seen in the elderly
77
Exposure to sunlight and other forms of radiation may increase the rate of aging T or F
True The rate of aging is influenced by the speed of DNA mutation formation, radiation increases the probability of mistakes in DNA synthesis that lead to cancer or aging
78
Within 6 days following fertilization, the blastocyst contains cells that are fated to become the infant T or F
True Within six days, the process of differentiation has resulted in the inner cell mass which will develop into the human embryo
79
Dizygotic twins share same placenta and are indentical. T or F
False Dizygotic twins result from the separate fertilization of two oocytes and are not identical (fraternal twins) monozygotic twins resulted from a single egg and are identical.
80
The study of abnormal fetal development is teratology T or F
True Many factors could cause birth defects and deformities, the study of these is called teratology.
81
The umbilical cord contains maternal and fetal components T or F
False The umbilical cord is derived from the embryonic stalk, but the placenta has both maternal and fetal components
82
Amniocentesis is a technique for examining the genetics of fetal skin cells T or F
True In amniocentesis, a needle is inserted into the amniotic cavity and fluid withdrawn, the fluid generally contains cells that have been sloughed off and can be used for microscopic and genetic studies to screen for possible defects
83
Postpartum meconium refers to the discharge of fluid from the skin or lungs T or F
False Meconium is the first fecal discharge of a newborn before food or milk has been ingested
84
The amount of elastic fibers increases during the aging process causing the lung tissue to regress and constrict T or F
False In aging, the amount of elastic tissue in the lungs decreases making it more difficult to exhale, from loss of elastic recoil
85
The cardiovascular system increases the synthesis of some lipids during the aging process. T or F
True The coronary artery lumens are decreased by the addition and synthesis of cholesterol-laden plaques made by the artery
86
The placenta is comprised of maternal and fetal portions T or F
True The fetal chorion and the maternal endometrium combine to form the placenta
87
The inner cell mass of the blastocyst will become the extra embryonic membranes and part of placenta T or F
False The ICM becomes the embryo proper

Anatomy 102 (12 decks)

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