Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

(3) MS: Pediatric Conditions > S1_L2: Fertilization, Implantation, and Embryonic Development > Flashcards

S1_L2: Fertilization, Implantation, and Embryonic Development Flashcards

1
Q

Fertilization is the process by which the sperm & the secondary oocyte fuse in what region of the uterine tube?

A

Ampullary region

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Widest part of the uterine tube

A

Ampulla

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

TRUE OR FALSE: When sperm enters, it can enter the egg in 30 mins to 5 days.

A

False, it’s 6 days

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Movement of sperm from the cervix to the oviduct or fallopian tube is accomplished primarily by their own propulsion, although they may be assisted by movements of fluids created by the ___.

A

uterine cilia

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Only 1% of sperm deposited in the vagina enter the cervix, where they may survive (survival of ~2-3 days). All other sperm die d/t physical stresses. Enumerate the 6 physical stresses.

A
  1. Ejaculation
  2. Contractions in female tract
  3. Change in pH environment
  4. Mucous secretions
  5. Defenses of female immune system
  6. Anatomy of the fallopian tube (narrow or double tract fallopian tube)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Life span of sperm in female reproductive tract

A

3 to 7 days

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What calls and attracts the sperm when the female is ovulating and they automatically swim faster in response?

A

Chemoattractants

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

At ovulation, sperm again become motile, perhaps because of chemoattractants produced by ___, and swim to the ampulla where fertilization usually occurs

A

cumulus cells surrounding the egg

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Spermatozoa are not able to fertilize the oocyte immediately upon arrival in the female genital tract but must undergo what to acquire this capability?

A
  1. Capacitation
  2. Acrosome reaction
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Glycoprotein coat / shell surrounding the egg that acts as a barrier to the sperm. It facilitates and maintains sperm binding and induces the acrosome reaction.

A

Zona pellucida

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Capacitation is a period of conditioning of the sperm while in the female reproductive tract that lasts for how long?

A

approximately 7 hours

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Enumerate the barriers protecting the egg

A
  1. Corona radiata
  2. Zona pellucida
  3. Plasma vitelline membrane
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Most important coat of the egg that protects inner organelles. It can stop or reject the other sperm to enter and only allows 1 sperm to get in.

A

Zona pellucida

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

TRUE OR FALSE: If no fertilization occurred, progesterone increases and sloughs off and menstruation occurs.

A

False, progesterone decreases

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

After reaching the ___, the sperm become less motile and cease their migration.

A

Isthmus

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

narrowest part of the fallopian tube

A

Isthmus

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Duration of the trip from cervix to oviduct or fallopian tube in fertilization

A

Minimum of 2 to 7 hours

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

In fertilization, what will prepare the uterus and increase progesterone that causes the thickened uterine wall to develop the characteristics needed for implantation?

A

Luteinizing hormone

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

During what period will the glycoprotein coat and seminal plasma proteins be removed from the plasma membrane that overlies the acrosomal region of the spermatozoa?

A

Capacitation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

TRUE OR FALSE: Only capacitated sperm that reach the egg can pass through the corona radiata cells and undergo the acrosome reaction.

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

TRUE OR FALSE: Only one sperm can be capacitated, thus allowing it to penetrate the egg and impregnate.

A

False, more than one

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

What enters the sperm and hyperpolarize the sperm’s plasma membrane, thus affecting the motility of the sperm?

A

Bicarbonate ions

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

The acrosome reaction is induced by?

A

Zona proteins

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

This reaction culminates in the release of enzymes needed to penetrate the zona pellucida

A

Acrosome reaction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

Enzyme that assists in penetration of the corona radiata barrier (1st layer)?

A

Hyaluronidase

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

What are the two enzymes that help to penetrate the zona pellucida (2nd layer)?

A
  1. Trypsin-like substance
  2. Acrosin
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

Enzyme that is needed for digestion of the zona pellucida (2nd layer)?

A

Trypsin-like substance

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

Determine the structures derived from the germ layers (in the embryo)

  1. Notochord
  2. Epithelial lining of digestive and respiratory tracts
  3. Epidermis of skin
  4. Pancreas
  5. Nervous system
  6. Musculoskeletal system

A. Endoderm
B. Mesoderm
C. Ectoderm

A
  1. B
  2. A
  3. C
  4. A
  5. C
  6. B
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

Determine the structures derived from the germ layers (in the embryo)

  1. Cornea and lens of eye
  2. Liver
  3. Lining of urethra and bladder
  4. Circulatory system
  5. Lining of reproductive system
  6. Muscular layer of stomach, intestine, etc.

A. Endoderm
B. Mesoderm
C. Ectoderm

A
  1. C
  2. A
  3. A
  4. B
  5. A
  6. B
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

Type of pregnancy where the embryo/fertilized egg implants and grows outside of the uterus.

A

Ectopic pregnancy

Additional: In this case, the mother will have a hard time giving birth or the baby may die inside the fallopian tube. As the embryo grows bigger and bigger, the fallopian tube will burst.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
31
Q

Condition where the embryo implants in the inferior portion of the uterus and the placenta can potentially grow over the opening of the cervix.

A

Placenta previa

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
32
Q

Enumerate the phases of fertilization

A
  1. Penetration of the corona radiata
  2. Penetration of the zona pellucida
  3. Fusion of the oocyte and sperm cell membranes
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
33
Q

The initial adhesion of sperm to the oocyte is mediated in part by the interaction of (1)___ on the oocyte and their ligands, (2)___, on sperm

A
  1. integrins
  2. disintegrins
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
34
Q

Permeability of the zona pellucida changes when the head of the sperm comes in contact with the oocyte surface. This contact results in release of lysosomal enzymes from the cortical granules lining the ___ of the oocyte.

A

plasma membrane

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
35
Q

The egg is arrested in which phase of meiosis II?

A

Metaphase II

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
36
Q

How many spermatozoa are deposited in the vagina during intercourse?

A

2-5 million

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
37
Q

In fertilization, only one sperm enters and the rest engage in disintegration of 3 barriers around the secondary oocyte via what enzyme?

A

hyaluronidase

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
38
Q

TRUE OR FALSE: When one sperm enters, the female barriers change and the rest of the male sperm make sure that no other sperm can enter the egg.

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
39
Q

Spermatozoa may remain viable in the female reproductive tract for how long?

A

48 to 72 hours

-This is the life span of sperm in the female

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
40
Q

What initiates capacitation of the sperm?

A

Reproductive tract of the female

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
41
Q

The acrosome reaction occurs after binding to the ___.

A

Zona pellucida

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
42
Q

TRUE OR FALSE: Once a sperm enters the egg, the others will be blocked off because zone 2 will be impermeable.

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
43
Q

Of the 2 to 5 million spermatozoa deposited in the female genital tract, how many reach the site of fertilization?

A

Only 300 to 500

Additional: Only 1 of these fertilizes the egg. It is thought that the others aid the fertilization sperm in penetrating the barriers protecting the female gamete.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
44
Q

Up to which of the 5 zones of the zona pellucida will the sperm be able to penetrate?

A

Zone 3

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
45
Q

Both binding and the acrosome reaction are mediated by the ligand ___, a zona protein

A

ZP3

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
46
Q

Release of ___ allows sperm to penetrate the zona, thereby coming in contact with the plasma membrane of the oocyte

A

acrosomal enzymes (acrosin)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
47
Q

The acrosomal enzymes alter properties of the zona pellucida to prevent sperm penetration. This process is known as?

A

zona reaction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
48
Q

Because the plasma membrane covering the acrosomal head cap disappears during the acrosome reaction, actual fusion is accomplished between the oocyte and the membrane that covers the ___ region of the sperm head.

A

posterior

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
49
Q

TRUE OR FALSE: In humans, both the head and tail of the spermatozoon enter the cytoplasm of the oocyte, but the plasma membrane is left behind on the oocyte surface.

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
50
Q

penetration of more than one spermatozoon into the oocyte

A

polyspermy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
51
Q

Enumerate the reactions that prevent polyspermy

A
  1. Cortical reaction
  2. Zona reaction
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
52
Q

As the spermatozoon enters the oocyte, the release of cortical oocyte granules occurs, which contain ___ enzymes. Then, the oocyte membrane becomes impenetrable to other spermatozoa.

A

lysosomal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
53
Q

The oocyte finishes its ___ meiotic division immediately after entry of the spermatozoon.

A

second

54
Q

The chromosomes (22+X) of the definitive oocyte (a result of meiosis 2) arrange themselves in a vesicular nucleus known as the ___.

A

female pronucleus

55
Q

TRUE OR FALSE: The male and female pronuclei are both haploid and replicate its DNA. Chromosomes organize in the spindle in preparation for normal mitotic division.

A

True

56
Q

TRUE OR FALSE: A result of fertilization is the restoration of the diploid number of chromosomes, half from the father and half from the mother. Thus, the zygote (fertilized ovum) contains a new combination of chromosomes different from both parents.

A

True

57
Q

a Y-carrying sperm produces a ___ embryo

A

male (XY)

58
Q

TRUE OR FALSE: The chromosomal sex of the embryo is determined at fertilization.

A

True

-We just can’t know it yet because it’s happening inside the fallopian tube

59
Q

TRUE OR FALSE: Initiation of cleavage is a result of fertilization.

A

True

Note: Without fertilization, the oocyte usually degenerates 24 hours after ovulation.

60
Q

After fertilization, mitosis occurs. After mitosis, cleavage occurs.
A. Only the 1st statement is true
B. Only the 2nd statement is true
C. Both statements are true
D. Both statements are false

A

C. Both statements are true

61
Q

Once the zygote has reached the two-cell stage, it undergoes a series of mitotic divisions, which increases the numbers of cells. This process is known as?

A

cleavage / segmentation

62
Q

The cells formed as a result of cleavage become smaller with each cleavage division. These cells are known as?

A

blastomeres

63
Q

Until the ___ stage of embryonic development, the blastomeres form a loosely arranged clump

A

eight-cell

64
Q

After the (1)___ cleavage, blastomeres maximize their contact with each other, forming a compact ball of cells held together by tight junctions. This process, known as (2)___, segregates inner cells, which communicate extensively by gap junctions, from outer cells.

A
  1. third
  2. compaction
65
Q

The 16-cell morula (mulberry) is formed from continuous division on Day __ after fertilization.

A

4

End product: 16 blastomeres

66
Q

The inner cell mass of the morula give rise to (1)___ proper, while the outer cell mass forms the (2)___

A
  1. tissues of the embryo
  2. trophoblast
67
Q

A method used to count the days of ovulation, with 14 days of infertility after a woman’s menstrual period

A

Rhythm / Calendar method

68
Q

It prevents pregnancy if it was taken 120 hours after sexual intercourse. A high dose of progestin is the result of taking this.

A

Emergency Contraceptive Pill (ECP)

69
Q

Differentiate vasectomy from tubal ligation

A

Vasectomy: Cut the vas deferens
Tubal ligation: Tie the fallopian tube

70
Q

It releases progestin that causes thickening of cervical mucus. It makes the sperm less active and have difficulty entering the egg.

A

Hormonal Intrauterine device (IUD)

71
Q

It releases copper to the uterus preventing fertilization or inhibits attachment of fertilized egg to the uterine wall, prevent sperm from entering uterine tubes.

A

Copper Intrauterine device (IUD)

Note: When a couple has sex, they will still not be able to produce an offspring. It will only implant but cannot fertilize.

72
Q

The use of condoms containing spermicides and female condoms lining the vagina is known as ___

A

Barrier method

73
Q

When estrogen or progestin levels are low, what hormones will release a follicle egg and thus, the menstrual flow occurs?

A

Follicle Stimulating Hormone and Luteinizing Hormone

74
Q

TRUE OR FALSE: When estrogen or progestin levels are high, FSH and LH will not be released. The female will not have the monthly period or may have a delayed period.

A

True

75
Q

What hormones can inhibit ovulation by preventing the release of FSH and LH from the pituitary gland, changing the lining of the uterus, and thickening the cervical mucus, thus making it difficult for sperm to enter uterus?

A

Estrogen and/or
Progestin

76
Q

Changes in the fetus during the ff months of prenatal development

  1. Lanugo begins to fall off
  2. Nearly all of the vernix and lanugo are gone
  3. Eyes and eyelids fully formed
  4. Start of 3rd Trimester
  5. Cerebral Cortex of the brain rapidly develops

A. 6th month
B. 7th month
C. 8th month
D. 9th month
E. 10th month

A
  1. C
  2. E
  3. A
  4. C
  5. B
77
Q

Changes in the fetus during the ff months of prenatal development

  1. Fat developing under skin
  2. Vernix is present
  3. Fingernails extend beyond the fingertips
  4. Crown Rump Length is about 7-8 inches
  5. Fetus has a firm grasp

A. 6th month
B. 7th month
C. 8th month
D. 9th month
E. 10th month

A
  1. A
  2. D
  3. C
  4. A
  5. E
78
Q

Changes in the fetus during the ff months of prenatal development

  1. Taste buds begin to form
  2. Subcutaneous fat is stored for later use
  3. Eyes have developed enough to constrict and dilate
  4. Bone marrow begins making blood cells
  5. Lanugo is shed

A. 6th month
B. 7th month
C. 8th month
D. 9th month
E. 10th month

A
  1. A
  2. C
  3. D
  4. A
  5. D
79
Q

Changes in the fetus during the ff months of prenatal development

  1. Hair begins to grow, hair is thin
  2. Arms bend at elbows
  3. Bones begin hardening
  4. The heart has formed and begins to beat faintly
  5. Gender of the fetus may be determined

A. 2nd month
B. 3rd month
C. 4th month
D. 5th month

A
  1. C
  2. A
  3. B
  4. A
  5. D
80
Q

Changes in the fetus during the ff months of prenatal development

  1. Begins making spontaneous movements
  2. Fingers and toes develop
  3. Sex organs are fully formed
  4. (Embryonic) tail disappears
  5. Ears and nose begin to develop cartilage

A. 2nd month
B. 3rd month
C. 4th month
D. 5th month

A
  1. B
  2. A
  3. C
  4. A
  5. D
81
Q

Changes in the fetus during the ff months of prenatal development

  1. Heart and blood vessels are fully formed
  2. The sex organ are the same in all embryos
  3. Can suck a thumb, yawn, stretch, make faces and grasp.
  4. Digestive organ begins to function
  5. Embryo develops into a fetus

A. 2nd month
B. 3rd month
C. 4th month
D. 5th month

A
  1. C
  2. A
  3. D
  4. B
  5. B
82
Q

Changes in the fetus during the ff months of prenatal development

  1. Fingernails and toenails begin to appear.
  2. Kidneys start making urine
  3. External ears, eyes, eyelids, liver, and upper lip had begun forming
  4. Head is more erect
  5. Posture becomes less curled and more upright

A. 2nd month
B. 3rd month
C. 4th month
D. 5th month

A
  1. D
  2. B
  3. A
  4. C
  5. B
83
Q

The embryo develops into a fetus after ___ weeks

A

10

84
Q

The sex organ are the same in all embryos until the ___ week.

A

7th or 8th

85
Q

A greasy biofilm material (white-cheesy substance) that covers and protects the skin of the fetus starting at the 5th month of prenatal development

A

Vernix caseosa

Note: When born, it is still on the baby

86
Q

A fetus is extremely preterm when born at or before ___ weeks of pregnancy.

A

25

87
Q

Final and longest phase of prenatal development

A

Period of the fetus

88
Q

Fetus responds to touch at (1)___ weeks and responds to light at (2)___ weeks

A
  1. 14
  2. 26
89
Q

Fetus responds to (1)___ at 29 weeks, can distinguish (2)___ at 34 weeks

A
  1. sound
  2. different speech sounds
90
Q

TRUE OR FALSE: Fetus can learn and remember when exposed to distinct sounds such as mother’s voice or distinct taste.

A

True

91
Q

The length from top of the head to bottom of buttocks

A

Crown Rump Length

92
Q

TRUE OR FALSE: On average, the neonate (newborn) is around 18-22 inches long and weights around 7-8 pounds.

A

True

93
Q

By (1)___ to (2)___ weeks, most systems function well enough that a fetus born at this time has a chance to survive (age of viability).

A
  1. 22
  2. 28
94
Q

Fetal orientation in the womb

A

Fetal position

95
Q

Refers to which part of the fetus is leading/closest to the birth canal

A

Fetal presentation

96
Q

TRUE OR FALSE: A fetus facing backward is in the abnormal position.

A

False, it should be facing forward

97
Q

Fetal presentation where the feet are leading / closest to the birth canal

A

Breech presentation

98
Q

The spermatozoa travels via uterine contraction and the oocyte travels via the ___ and rhythmical contraction of muscle of tube to reach the ampulla.

A

ciliary beat

99
Q

In male fetus, testes begin to descend into scrotum by 30th-34th week, completing on the ___ week.

A

40th

100
Q

fine, downy hair ​​that covers the body of the fetus

A

Lanugo

101
Q

The eyelids are usually fused together until the ___ week

A

28th

102
Q

Period where blastocytes are already imbedded

A

Week 2

-Week of pairs / doubles

103
Q

Period of the formation of 3 germ layers (endoderm, mesoderm, ectoderm), 3 important structures (primitive streak, notochord, neural plate), and the 3 layered chorionic villi

A

Week 3

104
Q

The period of the embryo spans how many weeks?

A

Weeks 3-8

105
Q

Gestational age starts on the ___ of a woman’s last menstrual period (LMP).

A

first day

Note: Women are pregnant for about 9 months, but because pregnancy is measured from a woman’s last menstrual period, a full-term pregnancy usually totals about 10 months.

106
Q

TRUE OR FALSE: All major organs and organ systems are formed during the period from 4th to 8th week.

A

True

2nd month is known as the Period of Organogenesis

107
Q

Known as the critical period in pregnancy where the embryo is most susceptible to factors interfering with development and congenital malformations

A

Second month

108
Q

Time when the three germ layers (ectoderm, mesoderm, and endoderm) give rise to a number of specific tissues and organs. The development of the nervous system also occurs.

A

3rd-8th week (Embryonic period)

109
Q

The period of the fetus spans how many weeks?

A

Weeks 9-38

110
Q

Trophoblast secretes ____ that directs the corpus luteum to survive, enlarge, and continue producing progesterone and estrogen to suppress menses, thus causing pregnancy symptoms

A

hCG or human chorionic gonadotropin hormone

111
Q

It creates an environment suitable for developing embryo and accumulates in the maternal blood stream. It is excreted in the urine.

A

hCG or human chorionic gonadotropin hormone

112
Q

For the pregnancy test result to be accurate and correct, when should the test be done?

A

After the 2nd week

113
Q

The process that the epiblast and hypoblast undergo, where 2 cell layers become 3 germ cell layers

A

Gastrulation

114
Q

The blastocele is a single cavity formed from the entering of fluid into the intercellular spaces of the inner cell mass, which become confluen. It eventually becomes the ___.

A

yolk sac

115
Q

The cells of the inner cell mass are known as the (1)___ and those of the outer cell mass, known as (2)___, flatten and form the epithelial wall of the blastocyst.

A
  1. embryoblast
  2. trophoblast (This later contributes to the placenta and plasma membrane)
116
Q

Day 3 of transitioning from cleavage to blastomere is the ___ stage

A

8-cell

117
Q

Day 2 of transitioning from cleavage to blastomere is the ___ stage

A

4-cell

118
Q

Integrin receptors for (1)___ promote attachment of the trophoblast, while integrin receptors for (2)___ stimulate migration.

A
  1. Laminin
  2. Fibronectin
119
Q

Process of the blastocyst (embryo) embedding/adheres into the endometrial lining (wall) of the uterus in Week 2

A

Implantation

Note: It is by this adhesion that the embryo receives oxygen and nutrients from the mother to be able to grow. The blastocyst will adhere to the FUNDUS of the uterus.

120
Q

At what day does the the zygote become a blastocyst?

A

Day 5

121
Q

The cells of the epiblast migrate in the direction of the primitive streak to form the mesoderm and the intraembryonic endoderm. This inward movement is known as?

A

Invagination

122
Q

Source of all 3 germ layers in the embryo

A

Epiblast

123
Q

Inner layer of mononucleated cells that came from the trophoblast

A

Cytotrophoblast

124
Q

Outer multinucleated zone without distinct cell boundaries that digests endometrial cells to firmly secure the blastocyst into the uterine wall

A

Syncytiotrophoblast

Note: Syncytiotrophoblasts are in sync with the endometrial lining. Gas and blood exchange starts to support the embryo.

125
Q

A layer (from embryoblast) of small cuboidal cells adjacent to the blastocyst cavity.

A

hypoblast layer

126
Q

A layer (from embryoblast) of high columnar cells adjacent to the amniotic cavity.

A

Epiblast layer

127
Q

At the 2nd week, a small cavity appears within the epiblast that enlarges to become the ___.

A

Amniotic cavity

128
Q

Epiblast cells adjacent to the cytotrophoblast are called ___. Together with the rest of the epiblasts, they line the amniotic cavity.

A

Amnioblasts

129
Q

TRUE OR FALSE: At the 2nd week, the blastocyst is partially embedded in the endometrial stroma. The endometrial stroma adjacent to the implantation site is edematous and highly vascular.

A

True

Additional: The large, tortuous glands secrete abundant glycogen and mucus.

130
Q

The primitive yolk sac is a cavity that formed on the side of the ___.

A

Hypoblast

(3) MS: Pediatric Conditions (11 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions