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Bio 30 AP > Reproduction and Development > Flashcards

Reproduction and Development Flashcards

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1
Q

What are Primary sex characteristics?

A

Organs present at birth (Testes, ovaries, penis, vagina)

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2
Q

What are secondary sex characteristics?

A

Developmental - prevalent after/during puberty (Facial hair, breasts, pubic hair)

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3
Q

What are ovaries?

A

Produce egg (Ovum), release estrogen and progesterone

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4
Q

What are the fallopian tubes?

A

Carries egg from ovary to uterus

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5
Q

What is the uterus?

A

The muscular organ where embryo develops

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6
Q

What is the cervix?

A

Tightly closed bottom of uterus, dilates during birth

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7
Q

What is the Vagina?

A

Birth canal, passage for sperm

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8
Q

What is the corpus Lutem?

A
  1. Temporary endocrine organ
  2. Old follicle after egg is released
  3. Broken down every month unless fertilization occurs
  4. Release estrogen and progesterone
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9
Q

What is the purpose of estrogen?

A

Thickens endometrium

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10
Q

What is the purpose of progesteron?

A

Maintains endometrium

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11
Q

What are the testes?

A

Produce sperm and testosterone

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12
Q

What are the seminiferous tubules? Where are they located?

A

Inside testes - Sperm production with Sertoli cells [FSH]

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13
Q

What are interstitial cells? Where are they located?

A

Inside testes - Produce testosteroen

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14
Q

What is the Epididymis?

A

Coiled tubes, store mature sperm

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15
Q

What is the vas deferens

A

Tube that carries sperm

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16
Q

What is the cawper gland?

A

Adds mucus to sperm, slightly basic

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17
Q

What is the seminal vesicle?

A

Adds sugar to semen (Energy for sperm)

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18
Q

What is the prostate gland?

A

Adds fluid to nourish and protect sperm (basic). Aids in release of sperm

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19
Q

What is the ejaculatory gland?

A

Opens to urethra, controls ejaculation

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20
Q

What is the urethra?

A

Tube that carries sperm and urine

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21
Q

What is the penis?

A

hehe (deposit sperm into vagina)

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22
Q

What are Sertoli cells?

A

Cells in seminiferous tubule that aid in sperm production

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23
Q

What is a germinal cell?

A

A cell that eventually becomes sperm

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24
Q

Where is the seminiferous tubule located?

A

In the testes

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25
Q

How many chromosomes do humans have?

A

46 (23 pairs)

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26
Q

What is the specific chromosome pair that determines sex?

A

23rd

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27
Q

What chromosomes do all humans have?

A

X

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28
Q

What chromosome do only men have?

A

Y

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29
Q

What does the Y chromosome dictate?

A

Stimulate production of testes

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30
Q

During development what do the testes secrete?

A

Secretes testosterone which leads to the development of male sex characteristics 6-7 weeks after fertilization.

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31
Q

What does the hypothalamus release to stimulate LH and FSH release from ant. Pit. Gland

A

GnRH

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32
Q

What does the pituitary gland secrete in response to GnRH?

A

LH and FSH

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33
Q

What is the role of LH?

A

Acts on interstitial cells to produce testosterone

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34
Q

What does FSH act on/role?

A

Sertoli cells - produce sperm (with the aid of testosterone)

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35
Q

What is the production of testosterone result in?

A

Negative feedback on hypothalamus

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36
Q

What does FSH do? [Females]

A

From pit. gland stimulates the growth of eggs. Signals ovaries to make estrogen

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37
Q

What is the role of FH? [Females]

A

Stimulates ovulation two weeks after menstruation. Stimulates corpus Luteum to make progesterone

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38
Q

What is the role of estrogen?

A

From ovaries, responsible for the development and regulation of the female reproductive system. Growth of endometrium

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39
Q

What is the role of progesteron?

A

From ovaries, prepares endometrium (Maintains and increases blood vessels)

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40
Q

What occurs on days 4-13 of the menstrual cycle?

A

Follicular phase - Blood levels of estrogen rise, growth follicle, medium levels of FSH and LH, low levels of progesterone, increase in endometrium thickness

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41
Q

What happens on day 14 of the menstrual cycle?

A

Ovulation - peak in LH levels, eggs released from ovaries, progesterone levels increase, estrogen lowers

42
Q

What happens on days 15-28 of the menstrual cycle?

A

Corpus Luteum increases progesterone levels, and estrogen slowly lowers until 28, when menstruation occurs

43
Q

What is menstration?

A

The shedding of the endometrium (if no implantation occurs)

44
Q

What is morphogenesis?

A

Biological processes that causes a cell, tissue, or organism to develop it’s shape

45
Q

What can pregnancy be split into?

A

Three trimesters or 2 halves

46
Q

How long is pregnancy?

A

9 months, 40 weeks

47
Q

What occurs during the first trimester?

A

Fertilization
Cleavage
Implantation
Gastrulation
Neurolation
Development of organs

48
Q

What is clevage?

A

To split

49
Q

What is nuerolation?

A

Formation of CNS

50
Q

When does an embryo become a fetus?

A

8 weeks

51
Q

What occurs during the second trimester?

A

Skin and hair grow
Fetal movement can be felt
Arms and Legs reach proportion
Eyes blink
Heartbeat can be heard (already developed in first trimester)

52
Q

What occurs during the third trimester?

A

Increase in size, development of lungs, and fingernails, fetus can survive if born at this stage

53
Q

What is the first half of pregnancy?

A

Embryonic development - Cells and tissues start to form, Structures to nourish embryo form

54
Q

What is the second half of pregnancy?

A

Fetal development - Body growth, organ function,and system formation

55
Q

When does fertilization occur? Where?

A

12 hours after ovulation, in the fallopian tubes

56
Q

What is special about eggs and sperm to allow fertilization?

A

Both are gametes, meaniing the have half the DNA (23 chromosones)

57
Q

When an sperm fertilizes a sperm what does it produce?

A

A zygote

58
Q

Why is there only one sperm for one egg?

A

Depolarization of egg membrane prevents multiple sperm from entering egg

59
Q

What is an acrosome reaction?

A

The acrosome reaction is a process where the acrosome, a cap-like structure on the sperm head, releases digestive enzymes to penetrate the egg’s outer layers.

60
Q

What is a cortical reaction?

A

The cortical reaction is an egg’s response to sperm entry, where enzymes from cortical granules harden the zona pellucida (eggs membrane), blocking additional sperm and preventing polyspermy.

61
Q

What is polyspermy?

A

Polyspermy is the fertilization of an egg by more than one sperm. This usually results in an abnormal number of chromosomes, leading to developmental issues that typically prevent the embryo from surviving.

62
Q

What happens to the zygote?

A

Zygote division (clevage) - stays same size however

63
Q

What does a zygotedevelop into?

A

Morula (16-32 cells)

64
Q

What does the Morula do?

A

Travles to the unterus (3-5 days)

65
Q

What does the Morula develop into?

A

The blastocyte

66
Q

What is the structure of a blastocyte?

A

A hollow ball with an inner cell mass

67
Q

What does the inner cell mass develop into?

A

Embroblast and then Embryo

68
Q

What is the cavity in a blastocyte called?

A

Blastocoele

69
Q

What is the outer layer of a blastocyte called?

A

Thropoblast

70
Q

What does the thropoblast develop into?

A

Chorion and then placenta

71
Q

What does the chorion deveolp into?

A

Placenta

72
Q

What does the embroblast develop into?

A

Embryo

73
Q

What is the role of the placenta?

A

Site of echange for oxygen and nutrients between mom and baby

74
Q

What does the blastocyte do after developing?

A

Implants into endometrium

75
Q

How does the trophoplast help implantation?

A

Releases enzymes to create path through endometrium

76
Q

What does the trophoblast secrete?

A

hCG (Human Chorionic Gonadtropin)

77
Q

What is the purpose of hCG

A

Maintains the endometrium by preventing breakdown of Corpus Luteum from breaking down (Continues to produce progesterone and estrogen)

78
Q

At what times during pregnancy is hCG highest?

A

First 2 months falls off after month 4

79
Q

What is responsible for hCG reduction by month 4?

A

After first trimester placenta produces enough progesterone and estrogen

80
Q

What is grastulation?

A

When the single layer blastocyte develops into a three layered structure known as the gastrula

81
Q

When does gastrulation occur?

A

Happens by week 2 after implantation

82
Q

What are the three germ layers that are developed in gastrulation?

A

Ectoderm
Endoderm
Mesoderm

83
Q

What does the ectoderm form into?

A

Skin and CNS

84
Q

What does the endoderm develop into?

A

Respritory tract, digestive tract, endocrine organs

85
Q

What does the mesoderm develop into?

A

Muscles, skeleton, blood vessels, reproductive systems

86
Q

What does the space between the germ layers and trophoblast develop into?

A

Amnotic sac

87
Q

What must happen to the Inner cell mass for gastrulation?

A

Mast flatten

88
Q

What occurs after gastrulation?

A

Neurolation

89
Q

What is neurolation?

A

Neurulation is the early developmental process in vertebrates where the neural tube, which eventually forms the brain and spinal cord, is created.

90
Q

What are the steps of neurolation?

A
  1. The ectoderm thickens to form the neural plate
  2. The edges of the neural plate begin to elevate, forming neural folds, while the center forms a depression called the neural groove.
    3.The neural folds continue to rise and move toward each other, while the neural groove deepens in the middle.
  3. The neural folds meet at the midline and fuse, forming the neural tube..
  4. The neural tube fully closes, creating a hollow structure that will become the brain and spinal cord.
91
Q

What occurs during weeks 3-8?

A

Membranes external to embryo develop, called extra-embryonic structures

92
Q

What are the extra-embryonic structures?

A

Chorion - Becomes placenta
Allantois - Becomes umbillical chord
Yolk Sac - Makes red blood cells until bone marrow is developed
Amniotic sac - Provides protection

93
Q

What does the trophoblast turn into?

A

Chorion

94
Q

What is the purpose of chorionic villi?

A

Increase contact area with maternal blood
Carry blood to umbillical chord

95
Q

After how long is the yolk sac around?

A

After 8 weeks the yolk sac shrinks

96
Q

What is the positive feedback during childbirth?

A
  1. Post Pit. Releases oxytocin
  2. Uterine contracts
    3a. Babies head pushes on cervix
    3b. Prostoglandins is released (causes contractions)
  3. Stretch recpetors send nerve impulse to post pit to release more oxytocin
97
Q

Where is there a nerve impulse during reproduction and developemt?

A

During birth - Stretch receptors pick up babies head pushing against cervix resulting in a nerve impulse to be sent to the Post Pit.

98
Q

What are the three stages of childbirth?

A
  1. Dialation (cervix, 10cm)
  2. Expulsion stage
  3. Placental Stage
99
Q

What is a tetratogen?

A

Cause abnormal development

100
Q

When is a tertogen most dangerous?

A

First 3 months - Greatest effect becuase cells are still dividing (greater % of damage)

101
Q

Why do teratogens have no impact the first 2 weeks after conception?

A

No connection between mom and kid

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